# m'Wi ^ 

# -s^pnecmiO M AIRMOTIVEikLG i 1 - ^-/iiJ i 

# m^ SE P 1 ! A ^:u q Septembe r 8 , 200 6 

# f^''-)-.^CXDU:"25^2'^ . 7 U.S . Department

o f Transportatio n Docket Management

System 40 0 7t hStreet , S.W . Roo mP L40 1 Washington , D.C . 20591-000 1 Re : Petitio n fo r

Rulemakin g Dea r Sir o r Madam : Petitioner Precisio n Airmotiv e LL C ("Precisio n Airmotive" ) hereb y submit s pursuant t o 1 4 CF R§ § 11.61 , 11.3 9 an d1 4 CFRp t 3 9 apetitio n fo

r rulemakin g requestin g a determinatio n o f

whether an airworthines s directiv e shoul db e issue dfo r al l general aviatio n aircraA/rotorcraf

t powere db y engine s wit

haMarve l Schebler , Face t and/o r Precisio n Aumbtiv e float

carbureto r

("Marve l Schebler " carburetors) . Precisio n Airmotiv e i s th e holder

o f aPart s Manufacturer

Approval ("PMA" ) fo

r thi s lin e o f carburetors . Precisio n Airmotiv e bning s thi s Petitio n in it s capacit y a s aPMA holder . Th e name , mailin g addres s an dother contac t informatio n fo

r th e petitionin g organizatio n is : Precisio n Airmotiv e LLC

14800 40t hAvenue , N.E . Buildin g D Marysville , Washingto n 9827 1 Contact : Scot

t L . Grafenauer , Presiden t

& Genera

l Manager Telephone : (360 ) 658-992 6 Facsimile : (360 ) 651-808 0 Email : scottg@precisionairmotive.co m Th e FAA ha s issue dtyp e certificate s fo r numerou s engine s that

us e Marve l Schebler carburetors . Th e overwhelmin g majorit y o f thes e carburetor s are installe do n engine s manufacture db y Avc o Corporation , Lycomin g Reciprocatin g Engin e Divisio n ("Lycoming") . Lycomin g join s i n Precision' s request . (Se e Ex . A. )

1480 0 40t h Avenu e N E * Marysville , Washingto n 9827 1 * USA - Phone : (360 ) 651-828 2 • Fax:(360)651-808 0

# Scot

t L . Grafenauer September

8 , 200 6 Pag e 2 Pursuan t t o 1 4 CF R§ 39.5 , th e FA A wil l issu e an airworthines s directiv e whe n i t finds: (a ) A n unsaf

e conditio n exist s in th e product ; an d (b ) Th e conditio n i s likel y t o exis t o r develo p in othe r

product s o f th e sam e typ e design . Precisio n Airmotiv e ha s receive dreport s criticizin g th e Marve l Schebler lin e o f float carburetor s a s bein g inherentl y unsafe . Th e report s criticiz e th e underlyin g desig n o f thes e carburetor s including , amon g othe r things , th e needl e valv e an dsea t assembl y an d th e body-to-bow l screws . Th e repoit s conten dthat th e Marve l Schebler

carburetor' s desig n ha s cause dnumerou s in-fligliL t engin e failure s in general aviatio n aircraft . (Se e Exs . B-G. ) Th e author s o f thes e report s als o conten dthat numerou s FA A servic e difficult y report s an dinciden t

an dacciden t

report s substantiat e an ddemonstrat e th e validity o f

thei r desig n criticisms , an ddemonstrate th e existenc e o f adangerou s unsaf

e conditio n fo

r al l user s o f

engine s that

are certifie dwithMarve l Schebler carburetors . (Se e Ex . H. ) The y conten dthat thes e desig n defect s i n th e carbureto r hav e resulte di n numerou s in-flight

engin e failure s tlia

t hav e cause ddeath s an dpersona l injuries . (Se e Ex . I. ) Thes e same source s o f

informatio n hav e advise dPrecisio n Airmotiv e that the y hav e no t communicate dthei r

concern s t o th e FAA . (Se e Ex . J. ) We hav e thoroughl y investigate dthes e criticism s an dhav e bee n unabl e t o substantiat e th e existenc e o f

thes e problems . Rather , ou r investigatio n reveal s that th e criticism s are unfounded . Nonetheless , th e informatio n provide dt o us , i f correct , satisfie s th e requirement s o f 1 4 CFR§ 39. 5 becaus e it

i s indicativ e o f

th e existenc e o f

"an unsaf e condition " tha

t exist s "i n othe r

product s o f

th e sam e typ e design. " Thus , i f th e criticism s are correct , th e FA A shoul dissu e an airworthines s directive . Sinc e th e FA A i s th e independen t federa l agenc y charge dwit

hensurin g th e safet

y o f aviatio n an dth e flying public , w e reques t i n th e interes t

o f aviatio n safet

y that th e FAA determin e whethe r

thes e desig n criticism s an dth e informatio n in th e FAA servic e difficult y reports , an dinciden t

an dacciden t

report s warran t

th e issuanc e o f

a n airworthines s directive , o r othe r remedial action .

09/08/0 6

# Scot

t L . Grafenauer September

8 , 200 6 Pag e 3 We reques t

that th e FA A mak e thi s determinatio n a s soo n a s possible . Marve l Scheble r carburetor s hav e bee n use di n genera l aviatio n aircraf t sinc e at leas t th e 1940 s an d hundred s o f

thousand s hav e bee n produced . W e estimat e that th e activ e general aviatio n aircraf t utilizin g thes e carburetor s ar e incurrin g million s o f flight hour s ayear . Accordingly , give n th e siz e o f th e fleet utilizin g thes e carburetor s an dth e numbe r o f flight hour s the y ar e accruing , i f th e criticism s ar e valid , ther e woul dexis t significan t

ris k o f injur y o r deatht o th e flying public . I n light o f this , i t i s i n th e publi c interes t

for th e FA A t o determin e th e need , i f any , for remedial correctiv e action . I n fijTtherance o f

th e FAA' s resolutio n o f

thi s petition , w e wil l provid e any an dal l information , assistance , records , documents , engineerin g drawings , an dal l relevan t technical an dscientifi c dat aavailabl e t o us , o r whateve r els e th e FA A deem s necessary , t o ai dth e FA A i n it s determinatio n o f whethe r a n airworthines s directiv e i s appropriate . Similarly , Lycomin g ha s indicate dthat i t to o wil l provid e th e FA A an y an dal l record s it ha s that wil l assis t

th e FA A i n resolvin g thi s matter . (Se e Ex . A. ) Respectfull y submitted . Scot t L . Grafenauer Presiden t & Genera l Manage r Precisio n Airmotiv e LL C

09/08/0 6

# r \ AIRMOTIV E LL C 

# r r r r r



# r 

# r r 

# r 

# r r r September

8,200 6 U.S . Departmen t

o f Transportatio n Docket Management

System 40 0 7t hStreet , S.W . Roo mP L40 1 Washington , D.C . 20591-000 1 Re : Petitio n fo r

Rulemakin g p Dea

r Sir o r Madam : Petitione r Precisio n Airmotiv e LL C ("Precisio n Airmotive" ) hereb y submit s pursuan t t o P 1 4 CFR§ § 11.61 , 11.3 9 an d1 4 CFRpt . 3 9 apetitio n for rulemakin g requestin g a * • determinatio n o f whethe r a n airwortlidnes s directiv e shoul db e issue dfor al l general aviatio n aircrafl/rotorcraf

l powere db y engine s wit

haMarve l Schebler , Face t and/o r I Precisio n Airmotiv e float carf)uretor

("Marve l Schebler " carburetors) . Precisio n Airmotiv e i s th e holde r

o f aPart s Mainufacture

r Approval ("PMA" ) for

thi s lin e o f carburetors . Precisio n Airmotiv e bring s thi s Petitio n i n it s capacit y a s aPM A holder . Th e name , mailin g addres s an dothe r contac t informatio n for

th e petitionin g organizatio n is : Precisio n Airmotiv e LL C

14800 40t hAvenue , N.E . Buildin g D Marysville , Washingto n 9827 1 Contact : Scot

t L . Grafenauer , President

& General Manage r Telephone : (360 ) 658-992 6 Facsimile : (360 ) 651-808 0 Email : scottg(%precisionairmotive.co m Th e FAA ha s issue dtyp e certificate s fo r numerou s engine s that

us e Marve l Schebler carburetors . Th e overwhelmin g majorit y o f thes e carburetor s are installe don engine s manufacture db y Avc o Corporation , Lycomin g Reciprocatin g Engin e Divisio n ("Lycoming") . Lycomingjoin s i n Precision' s request . (Se e Ex . A. )

1480 0 40t h Avenu e N E • Marysville , Washingto n 9827 1 • US A• Phone:(360)651-828 2 • Fax:(360)651-808 0

# r Scot

t L . Grafenauer Septembe r

8,200 6 Pag e 2 Pursuan t t o 1 4 CF R§ 39.5 , th e FA A wil l issu e an airworthines s directiv e whe n it finds : (a ) A n unsaf

e conditio n exist s in th e product ; an d (b ) Th e conditio n i s likel y t o exis t or develo p i n othe r

product s o f th e sam e typ e deisign . Precisio n Airmotiv e ha s receive dreport s criticizin g th e Marve l Scheble r lin e o f float carburetor s a s bein g inherentl y unsafe . Th e report s criticiz e th e underlyin g desig n o f thes e carburetor s including , amon g otllie r things , th e needl e valv e an dseat assembl y an d th e body-to-bow l screws . Th e report s conten dtha t th e Marve l Schebler

carburetor' s desig n ha s cause dnumerou s in-flight engin e failure s i n genera l aviatio n aircraft . (Se e Exs . B-G. ) Th e author s o f thes e report s als o conten dthat numerou s FA A servic e difficult y report s an dinciden t

an dacciden t

report s substantiat e an ddemonstrat e th e validity o f

thei r desig n criticisms , an ddemonstrat e th e existenc e o f adangerou s unsaf

e conditio n fo

r al l user s o f

engine s that

ar e certifie dwit

hMarve l Schebler

carburetors . (Se e Ex . H. ) The y conten dthat thes e desig n defect s i n th e carbureto r hav e resulte di n numerou s in-flight

eiigin e failure s that

hav e cause ddeath s an dpersona l injuries . (Se e Ex . I. ) Thes e sam e source s o f

informatio n hav e advise dPrecisio n Airmotiv e tha t the y hav e no t communicate dthei r

concern s t o th e R\A . (Se e Ex . J. ) W e hav e thoroughl y investigate dthes e criticism s an dhav e bee n unabl e t o substantiat e th e existenc e o f

thes e problems . Rather , ou r investigatio n reveal s that th e criticism s ar e unfounded . Nonetheless , th e informatio n provide dt o us , i f correct , satisfie s th e requirement s o f 1 4 CFR§ 39. 5 becaus e i t

i s indicativ e o f

th e existenc e o f

"an unsaf e condition" that exist s "i n othe r

product s o f

th e sam e typ e design. " Thus , i f th e criticism s are correct , th e FA A shoul dissu e an airworthines s duective . Sinc e th e FA A i s th e independen t federal agenc y charge dwit hensurin g th e safet

y o f aviatio n an dth e flying public , w e reques t i n th e interes t

o f aviatio n safet

y that th e FA A determin e whethe r

thes e desig n criticism s an dth e informatio n in th e FAA servic e difficult y reports , an dinciden t

an dacciden t

report s warran t

th e issuanc e o f

a n airworthines s directive , o r othe r remedial action .

09/08/0 6 

## I

# Scot

t L . Grafenauer September

8 , 200 6 Pag e 3 We reques t

that th e FA A make thi s determinatio n a s soo n a s possible . Marve l Schebler carburetor s hav e bee n use din general aviatio n aircraf t sinc e a t leas t th e 1940 s an d hundred s o f

thousand s hav e bee n produced . We estimate tha t th e activ e general aviatio n aircraf t utilizin g thes e carburetor s are incurrin g million s o f flight hour s ayear . Accordingly , give n th e siz e o f th e fleet utilizin g thes e carburetor s an dth e number o f flight hour s the y ar e accruing , i f th e criticism s are valid , ther e woul dexis t significant

ris k o f injur y or deat ht o th e flying public . In light o f this , i t i s in th e publi c interes t

fo r th e FAA t o determin e th e need , i f any , fo r remedial correctiv e action . In fiirtherance o f

th e FAA' s resolutio n o f

thi s petition , w e wil l provid e any an dal l information , assistance , records , documents , engineerin g drawings , an dal l relevan t technical andscientifi c dat aavailabl e t o us , o r whatever els e th e FAA deem s necessary , t o ai dth e FAA i n it s determinatio n o f whethe r a n airworthines s directiv e i s appropriate . Similarly , Lycomin g ha s indicate dtha t i t to o wil l provid e th e FAA any an dal l record s i t ha s that wil l assis t

th e FA A i n resolvin g thi s matter . (Se e Ex . A. ) Respectfully submitted . Scot t L . Grafenauer Presiden t & General Manage r Precisio n Airmotiv e LL C

09/08/0 6

# Exhibit s t o Precisio n Airmotiv e LLC' s Petitiomfor

Rulemaldng * Ex . A 

# Ex. B Ex. C Ex. D Ex. E Ex.F . 

# Ex. G Ex. H Ex . I Ex . J Lycomin g Lette r t o DO T Affidavi t o f Richar dMcSwai n Affidavi t o f Do n Somme r Repor t o f Richar dMcSwai n Repor t o f Do n Somme r Testimon y o f

Richar dMcSwai n Testimon y o f

Do n Somme r FA A Servic e Difficul t

Report s Excerpt s o f

Testimon y fro m Richar dMcSwai n an dDo n Somme r Testimon y o f

Richar dMcSwai n Testimon y o f

Do n Somme r 7/13/200 6 9/29/0 4 10/1/0 4 2/21/0 6 12/17/0 3 2/17/0 6 12/15/0 3 2/3/05,2/6/0 5 1/9/0 4 1/12/04 2/11/0 3 1/13/04

1/12/04 1/12/04,1/20/0 4

' Som e o f thes e exhibit s hav e independent enclosures , man

y o f which hav e been omitte dfo

r brevity , bu t

any andall ar

e availabl e upon request . Similarly , only excerpt s o f depositio n andtria

l testimony hav e bee n included , bu t entire transcript s ar

e availabl e upon request . 

# r 1Aitaxtro n Compan y Lyoomki g EngbiM , I t a dtiMo n o f Avo o Coipoiadon , • wAol yowM d

tufaiiidiai yo f Textro n Inc . aSZOIAwrStfaa t Ta t 570-327-725 9 o r817-280.2S4 3 WIINamaport , P A1770 1 Fax : 817-27M54 3 

# U.S . Department

o f Tiansportatio n Docke t Management

System 40 0 7thStreet , S.W . Roo mP L40 1 Washington , D.C . 20591-000 1 Jul y 13,200 6 Re : Precisio n Airmotiv e LL C ("Precisio n Airmotive" ) Petitio n fo r Rulemakin g Marve l Schebler

Carburetor s Dear Si r o r Madam : Th e petitio n fo

r propose drulemakin g o f

Precisio n Airmotiv e relatin g t o th e Marvel-Schebler carbureto r ha s bee n reviewe db y th e Lycomin g Engine s divisio n o f Avc o Corporation . Avc o urge s th e FAA t o mak e th e determinatio n sought therein . Avc o Corporatio n wil l provid e any infoimatio n i t ha s availabl e t o i t

that woul dassis t

th e FAA i n makin g it s determination . I f yo u hav e an y questions , pleas e contac t us . Ver y toiily your s Ti mJ General

CU-l29669Sv l

# r r 0 * 

# r r r r r 

# nr r r r r r r r r AFFIDAVI T O FIJCHAR PH . McSWAIN . Ph.D. . P.E .

STAT E O FFLORID A COUNT Y O FESCAMBI A BEFOR E ME , th e undersignei dauthority , dul y authorize dt o tak e acknowledgments , personall y a]q)eare dRichar dH . McSwsiin , PhD. , P.E. , afte r firs t bein g dul y sworn , dqx)se s an d saysdiat : 1 . I a maconsultin g material s engineer , an dprincipa l enginee r wit hMcSwai n Engineering , Inc . i n Fensacc»la , Florida . 2 . I hav e bee n enqjioye dmmaterial s engineerin g an dmaterial s failur e analysi s continuousl y fo r

th e pas t 2 7 years . I wa s enq)Ioye db y th e U.S . Nav y a s amaterial s enginee r wit hresponsibilit y fo r

material s &ilur e analysi s an dacciden t investigatio n an d ultimatel y becam e hea do f th e Metalli c Material s Engineerin g Branch . M y curriculu m vita e i s enclose di n Enclosui e 1 . 3 . I a mcurrentl y aregistere dp'rofessiona l enginee r i n th e Stat e o f

Florid ab y examinatio n i n bot hmetallurgica l en^neeiin g an dmechanica l engineering . 4 . I hav e analyze dthousand s o f feilures i n bot hmetalli c an dnon-metalli c components . 5 . M y laborator y ha s extensiv e material s failur e analysi s C£^ability wid i stat e o f th e ar t scientifi c equipmen t 6 . I n m y researc hI hav e foun dtha t aircraf t carbureto r

failur e i s a n airworthines s issu e an d i s fligh t safet y critical . Ther e hav e bee n numerou s FA A Airworthines s Directive s issue dconcernin g Precisio n Airmotiv e carburetors , a s show n i n Enclosur e 2 . 7 . I n m y researc hcoiKemin g Precisio n Airmotiv e carburetor s I hav e foun dtha t Precisio n Airmotiv e ha s ha dahistoi y o f caihureto r

malfunctio n an dfailio e du e t o loosenin g o f th e carbureto r

throttl e body-to-bow l screw s a s indicate db y interna l Precisio n Airmotiv e (formed y Marvel-Schebler ) document s (Enclosur e 3 ) an db y FA A Servic e DifBculty Report s (Enclosin e 4) . 8 . I n m y researc hconcernin g Precisio n Aimiotiv e carburetor s I hav e foun dtha t Precisio n Airmotiv e ha s ha dahistor y o f caibureto r

malfunctio n an dfailur e du e t o needl e valv e stickin g a s mdicate db y Precisio n Airmotiv e (formeri y Marvel-Sdiebler ) an dFA A document s (Enclosur e 5 ) an db y FA A Servic e Difficulty Report s (Enclosur e 6) .

AMnM I

# o

r ) 9 . I n m y laborator y analysi s o f Ptecisio n Airmotiv e carimretcn ^ I hav e foun devidenc e o f manu&cturin g induce dburr s o n th e stainles s stee l needl e valv e sur&c e an dmachinin g groove s o n di e bor e surfac e o f di e t»as s needl e valv e sea t 10 . Th e Precisio n Airmotiv e carbureto r stainles s stee l needl e valv e burr s an dth e bras s needl e valv e sea t

machinin g gtoove s constitut e manu&cturin g defect s i n th e subjec t carbureto r

an dpotentiall y i n all-Precisio n Ainnotiv e carburetors . 11 . I n m y laborator y analysi s o f Precisio n Airmotiv e carburetor s I hav e foun devidenc e o f wea r grooves , ridge s an ddeforme dmateria l i n th e bras s needl e valv e sea t fro m contac t wid i th e stainles s stee l needl e valve . 12 . I n m y laborator y analysi s o f Precisio n Airmodv e carburetor s I hav e foun devidenc e o f stainles s stee l materia l tt^nsifer firomth e stainles s siee l needl e valv e t o th e seat , indicativ e o f

needl e valv e bindin g an dsticking . 13 . Th e Precisio n Aimiotiv e caibuiieto r materia l incompatibilit y betwee n th e stainles s stee l needl e valv e an dth e bras s seat i s addresse di n th e U.S . Paten t No . 5385,697 , "Carbureto r

Floa t an dMetho do f

Formin g Same " (Enclosur e 7) . Th e patent , whic hi s applicabl e t o Precisio n Ainnotiv e carburetors , state s dia t usin g astainles s steel-to stednles s stee l coupl e instea do f brass-to-stainles s stee l "substantiall y reduce s th e wea r betwee n th e cli p an dth e floatni^ntrolle dneedl e valve. " However , Precisio n Airmotiv e continue s t o us e th e brass-to-stainles s stee l materia l combinatio n fo r th e needl e valv e an dsea t 14 . Th e Precisio n Ainnotiv e carbureto r stainles s stee l needl e couple dwit habras s needl e valv e sea t

i s adefectiv e materia l selection . 15 . I n m y researc hconcernin g Precisio n Airmotiv e carburetor s I hav e foun dtha t a Precisio n Airmotiv e majo r cai^buretor

rcpz k ki t containin g afloat

valv e assembl y ca n b e procure dfo r

$476.62 . 16 . Precisio n Airmotiv e ha s be« i presente dwit hsufficien t evidenc e o f

carbureto r manu&cturin g an dmateria l selectio n defect s t o b e fiill y cognizan t o f th e aforementione ddefects . Multipl e lawsuit s (i.e . Blanto n v . Precisio n e t al ; Kaiso * v . Precision , e t

al. ; Eige n v . Precision , e t aL ; Thoma s v . Precision ) an dPrecisio n Airmotiv e warrant y claim s (Enclosur e 8 ) hav e provide dsufficien t prio r notic e t o Predsio n Ainnotiv e o f

th e defectiv e conditio n o f thei r carburetors . 17 . I n m y researc h-conceaming Precisio n Airmotiv e carburetors , I hav e foun dn o evidenc e tha t Precisio n Ainnotiv e ha s provide dan y warnin g o f th e potentia l an dcatastrophi c failur e mode s tha t

ma y occu r

i n th e Precisio n Airmotiv e carburetors . Precisio n Aircraf t Carbureto r

Servic e Manua l FSM-OH l onl y require s inspectio n o f carbureto r component s fo r

"abnorma l wear... " bu t doe s no t addres s th e roo t

caus e fo r thi s wea r o r th e potentia l consequence s o f th e wear . (Enclosur e 9 )

( •

> ABMaiLO l

# r r r r 

# r r r o 18 . Despite bein g ftiUy awar e o f di e carbureto r

defect s an dhavin g ampl e ton e t o correc t di e defects . Precisio n Airmotiv e ha s £aile dt o correc t

th e deficiencie s i n thei r carburetors .

FURTHERAFFL\N T S AYET H NAUGHT .



# RI ( AIUDRMCSWAIN,PH!D. , P.E .

STAT E

# O FFLORID A ) )s s COUNTY O FESCAMBIA ) 

# 0 r r 

# r r Th e foregoing instrument wa s sworn t o an

dacknowledge dbefor

e me thi s 29t

hday o f SqHembe r 2004 , b y RichardH . McSwain , Ph.D. , P.E. , wh o i s personally know n t o me .

Notar y Publi c \ M y Commissio n Expires : 6/19/200 5 Commissio n No . DD00803 7 200 6 

# (SEAL ) Nanc y H . Pursel l Printe dNam e o f

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## EA-21 A EASTER N REGIO N FEDEKAI LBUIt.O»« G JOH M F . KCNNED V INTEKHATIONA L AIRPOH T JAMAICA . NC W VOM K« I «S O 

## SUBJECT : MalfuDctlo n o r

Defec t Report s Avc o Lycomin g Dlvlalo n • Avc o Corporatio n ~ ~ Attention ; lltrip7~C , Bob a - - - THI S DOCUMEff rAN D TH E INFOBMATIO N CONTAINE D HEREI N I S TH E PROPERTYO P tYCOMING . ATEXTRO N COMPANY . AN Y REPRODUCTION . DISCLOSUR E O H US p THEREO F I S PROHIBrTE D EXCEP TA S AUTHORIZE D I N WRITIN G B YLYOOMtNQ . RECIPIEN TACCEPT S TH E HESPONSIBILTO . FO R MAINTAININ G TH E CONFIDENtlAttTY . O F TH E CONTENT S O F THIS . OOCUMCm : 

## Cbl« £Quallflctttlo n Enginee r Wllllasuport , Pennaylvanl a1770 1 

# AU G1 6 19 7 i 

# r ^ Enclosed.fo r you r revie war e Malfunctio n oi r Defec t Beport s receive d fro m th e field . Excep t fo r th e vAgnet o ca m retainin g acre v problem , ^ e othe r servic e difficultie s liste d belo v hav e bee n dlscnsae d vlt b yo u and shoul d b e o r ar e alreadybein g considere d fo r correctiv e action . 1 . Magnet o Breaker - Poin t Ca n Screw : Malfunctio n conala t o f th e ca n retainin g aCre w becomin g loose . Liste d belo w ar e th e engine s aii d aircraf t whic h experience d thi s failure , som e o f whic h resulte d i n force d landings . A s yo u will.note , thl a proble m i a no t confined'- , t o anyon e mode l bu t tia s occurre d oi

i severa l Lycomin g mode l engines . I t i s suggeste d tha t durin g th e 10 0 hour s inspectio n o f th e breake r points , inspectio n and chewin g . o f th e ca mscre w torqu e b e als o ^xe«|uii:ed . Enein e Mode l K 0-23 5 X 0-235-C l A 0-320-E2 D •5:0-32 0 : \O-320- E >10-320-E2 A

. I0-32O-B1 A A'/K0-36 0 XO-360-AA A < 0-36 0 ; 0-36 0 VO-360-AA A ;>10-360-Al A ( 10-36 0 I 0-5«i 0 • 0-540-B4B 5 A 10-540-O i \I0-540-1A 5 y10-54 0 ZfX i L-9688-1 5 L-9710-15 . L-22616-27A o L-12386-36A r L-A398-55 A L-15248-36 A L-13806-36 A L-12767-3i7 A

L-A081-42 ' L-882-4 8 L-6111-4 8 Aircraf t

Champio n Champio n Ceasn a 3lawdo n Pipe r Champio n Flp K Moone y Pipe r Pipe r Pipe r Pipe r Pipe r Moone y Pipe r Pipe r Pipe r Aer o Coomande r Pipe r S/ N

68 5 172-5700 7 28-2570 6 22 « 30-192 4 70008 9 28-498 8 28-569 7 28-536 0 28-500 0 32-25 9 1015^3 8 23-398 7 Re K

No . N-5168 Z M-5187 X N-4604 2 N-6808 6 M-8852 M N-5250 Z M-8768 T M-680 6 ' H-3471 B H-7944 H H-6SS4j r n-7736 N M-6668 Z N.3398 V ltr6454 T M.6I55 Z M-6670 T 

# ••

. r /?• > 1 -' ^ 5"- ' '

- - J > - - i J



## - " .r * - ^ • •70 0 •^^ * z * * * •* ' 2 ^ : 3- j ?.i:- > 

## 7 V - 

## f i T

i !• • : LYC177 7

### r - - ;J -



## ( 1 2 i Rocke r Bo x Cover : Liste d belo war e 2 2 incident s o f redce r valv e

shaft s wearin g hole s throu ^ th e rocke r bo x covers . Th e proble mi s confine d t o Lycomin g 0-32 0 Mo<le l engine s wit h th e paralle l valv e cylinders . Severa l o f th e englne a Include d I n thi s lis t wer e nsna facture d afte r Lycomin g isaue d Servic e Instructio n No . 1176 , whic h require s th e valv e rocke r shsft s t o be-groun d an d polishe d t o 1 0 mlcrorinche s finish . I t i s suggeste d tha t Lycomin g giv e seriou s consideratio n t o revisin g thei r presen t servic e instructio n and requir e rocke r cove r remova l soone r tha n 40 0 hour s o f operation . Engine s Mode l

>"^ , X 0

/ : 0 X 0



# ' ' xo 0

A O ;» f 0 

## 2<r3 , •320-E2 A

•320-S2 A •320-E2 A •320-A2 A •320-Z2 A •320-Z2 A •320-Z2 A -320-B2 A .320-Z2 A •320-E2 A •320-B2 A •320-E2 A 326-E2 A 320-E2 A •320 - •320-E2 A •320-E2 D •320-E2l> ' •320-E2 D •320-E2 D .320-E2 D •320-D2 A 

## S/N .

L-18829-2 7 L-2574 8 L-18945-27 A L-27120-27 A L-19337-27 A L-19337-27 A L-25899-27 A L-17721-27 A L-16294-27 A L-18725-2 5 L-25387-27 A L-26334-27 A L-26903-27 A L-25289-27 A L-25799-27 A L-25730-27 A L-26161-27 A i.-25532-27 A L-5219-3 9 Aircraf t

Pipe r Pipe r Pipe r Pipe r Pipe r Plpei r Pipe r Pipe r Pipe r Pipe r Pipe r Pipe r Pipe r Pipe r Pipe r Cessn a Cessn a Cessn a Cessn a Cessn a Pipe r S/ N

28-2304 7 28-2589 6 28-2337 2 28-2660 1 28-2505 7 28-2505 7 28-2645 4 28-2236 8 28-2154 5 28-2302 2 28-2252 9 28-2581 0 28-2609 4 28-2642 4 172-5616 7 172-5840 5 172-5831 5 172-5843 8 28-126 1 Rejjjte .

N-9S97 W H-9534 3 N-98S8 H N-5777 * H-5754 P N-3754 F H-5658 U N-8464 R N-6372 R M-9578W M-4189 J H-9511 5 N-9819 0 H-7231 P H-S628 V R-6427 8 N-8405 0 M-8435 3 N-7996 6 3 . Marre l Scheble r Carburetor : Sinc e 197 0 ther e hav e bee n report s o f 1 6 Incident s o f

throttl e bod y an dbowl'coye r assei^ly-t o carbureto r bod y assembl y bolt s becomin g .loose . Th e presen t attachmen t

call s fo r capscre w wit hlocKwashers . Previousl y th e capscrew s wer e saftj ^ wired * Engin e Mode l

- 0-320-E2 D A0-320-E2 D " 0.-320-E2 D / 0-320-E2 D /i^.L0-320-B2D c 0-320-E2 D

- 0-3^>D2 A 'rO-320-E2 D 7 0-320-E2 D • 0-320-E2 D S/ N

L-26193-27 A L-21751-27 A L-23808-27 A L-25865-27 A L-23410-27 A Aircraf t

Cessn a Cessn a Cessn a Cessn a Cessn a Cessn a Pipe r Cessn a Cessna ' ' iCessna S/ H

172-5861 7 172-5660 6 172-5679 8 172-5765 0 172-5843 6 28-318 9 172-5744 5 172-5670 7 172-5676 3 iSMJSS. '

N-8480 1 N-8406 L Nr3549 l N-7851 7 N-8453 1 N-7879 2 N-5918 » N-4671 2 H-3531 4 H-3542 5



## JLYCirre : ^

# r I 

# r r r Engin e Mode l



# ? 0-320 - 0-320-Al A X. 0-320 - f 0-320-E2 D

. 0-36 0 / 0-36 0 S/ H

L-22389-27 A L-7675-36 A Aircraf t

Cessn a Pipe r Cessn a Cessn a Pipe r Pipe r 172-5779 6

25-3 2 172-5698 0 172-5877 4 28-378 8 28-209 6 K * * WO .



## H-7897 8 N-6027 Z M-4600 1 M-9631 J M-8Q30 W 4 . Intak e Pipe ; Llsted'belo w ar e ^ 0 reporte dfailure s oJ E Intak e pip e cradcln g a t

th e flang e location .



# n Engin e Mode l XO-320-E2 C /.I0-320-B1 A 7 10-32 0 X 0^360-A2 G y I0-360-A2 B X10-30Q-A2 B <'tO-360-Bl A XIO-360-A1 A

. >-I0r360-Al A /*7 ^ HI0-360-A1 A

. XH10-360-C1 B / f lTk> 0 HIO-36O-01 A ' V0-540-E4C 5 T I0-540-G1C 5 \10-540-KlA 5 

## ' • ' _.?io-54rr X0-540-E1B 5 K 10-540-C1C 5 K I0-540-E1A 5 ? IO-54b-GlB 5 >10r540-mA 5 Jfl0-540-B1A 5 ;V10-540-K1A 5 K IGSO-540-A1 D > TIO-S40-A U V TIO-540-A1 A > f T1O-540-A1 A 

## ^TIO-540-Al A f 10-72 0 S/ N

L-23678-27 A L-3870-55 A L-13371-36 A L-3426-51 A L-2163-5L A L-1303-51 A L-3717-51 A L-6139-51 A . L-3936-51 A L-7433-51 A L-12175-4 0 L-5779-4 8 L-7826-4 8 L-41.7-4 8 L-5i85-:4 8 L-347-4< r L-6962-4 8 L-1819-5 0 L-244-6 1 L-271-6 1 L-630-6 i Aircraf t

Beec h Pipe r Pipe r Beech . Beec h Beec h Pipe r Moone y Moone y Hughe s Enstra m Huii^e s Britte n Morma n Aer o Commande r Pipe r Te dsmit h Aer o Coimsander ' Aer o Commande r Aer o Sta r Aer o Commander . Aer o Star Pipe r Aer o Cammande r Pipe r Beec h Pipe r Pipe r Pipe r Pipe r Pipe r M 417. .

30-177 6 30-169 6 M-118 4 MA-25 3 MA-2 5 30rll0 3 66 1 67040 0 69042 1 100005 2 2 7 32-4049 5 60-0023-4 1 306 4 133 0 500B-1187-9 4 60>004 7 . 32-4037 7 500B-1482 ^ 32x714001 5 LP-1 2 31-28 2 3 1 - 31-27 5 26-5 6 Rgf

t Ho , M-lOlF O H-8635 T H-8535 T M-6084 R M-5770 V M-7998 T W-6294 V K-9548 F M-9634 F N-4145 K N-12P B H-7745 V N-9077 M M-7602 V H-7833 6 N-7496 S H-4068 R 11-491 8 N-8622 9 II-889 C H-9218 T H-9211 T Hr8478 P V e woul dappreciat e you r comaent ai n regar dt o th e abov e Item s an d wha t actio n yo u hav e take n o r inten dt o tak e t o preclud e th e possibilit y o f futur e incidents . Copie s o f th e abov e Mfi

D Report ahav e bee n give n t o yo u previously , however , fo r you r convlenc e additiona l copie s ar e enclos e C . H . SWEENE

Y Chief , Propulsio n Section , EA-21 4 Enclosure s 

# M

LYC177 9

# \*

i 

## . • ' DEPARTMENT O F TRANSP i tfATIO M



## FEDERA L AVIATIO N ADMINISTimTIO N DAT t 30OEC1S7 V % ^ l EA-21 U SUBJECT : M^tlfUQctlO H o r

Defec t Report s 

# Co/'/ -

EASTER N REGIO N rcocRA L auttciN C JOH N f . KCNNtD Y INTCIINATtO^•A L A l JAMAICA . HC W VOK K«l«3 0 

# J

I f ) j^rc o Ijycooin g Divisio n

Avc o Corporatio n Attention : Mr . F . C . Bota n Chie f Qualificatio n Enginee r WilUaiB^rt , Pennsylvani a1770 1 - - - THI S DOCUMEN T AN D TH E iNFOBUATIOM ' CONTAINE D HEREI N I S TH E PROF^T V O F LYCOMWQ . A TEXTRO N COMSS^^AN Y ?S?Sg?^,?'*' « DJSa.OSLW E .O R US E 

# IUfSSHTzEo'" .N^^^i^lJFeY'^a.^ ^ 

# ?o^'''aits.^%>i?^c8li S O F TH E CONTENT S O F -mi S DOraniiF^i T 

# I

£nclose dfo r

you r revie w ar e copie s o f sixty-fiv e MalfuncUo n o r Defec t Beport 8 receive dfro mth e fleiLd . Include dar e th e following: . 1 . Seve n incident s o f Marve l Scheble r

carbureto r

throttl e bod y an dhow l cover-assembl y t o carl>ureto r isod y asseinbl y bolt s loosening . A s pointe d ou t In . ou r meetin g o' f

l 6 Deceiabe r

1971 / thi s conditio n I s confine dt o th e 0-32 0 mode l whe n installe do n Cessn a17 2 aircraft. - ^ . Iber e wer e eleve n incident s o f magnet o difficulties . Include dar e -thre e Incident s o f

ijnpiils e coiiplln g hushin g fallinres . Ve woul db e in - tereste dt o know i f

th e faile dbushin g wer e manufactufe dfro mstee l o r sintere diron . 3 . Fou r engin e mount s (P/ N697OI ) cracking . Ui e engin e mount s wer e installe do n IG0-5'»0-Bl A model . Ohe part s wH l b e forwardie d.t o yo u unde r separat e cover . . h . Crankshaf t

failur e o n aVO-5't

O mode l engin e Installe dIn. aBfel l ^7? - 2 A helicopter . (Ih e failur e occtirre da t th e Ito . 2 crankpl n location . 5 . Tu o MorD' s concerne dcranlccas e bearin g dowe l failures . Bot hwer e wit hth e steppe dtyp e dowels . On e inciden t

occia*e d20' » hour s afte r 4«beckln g an dretorquin g th e ciraokcas e througj i bolt s i n comp H nnc e wit h A D 71-5-2 , 6 . Tw o failure s o f

th e A C oi l filte r

throug hbolt . Bi e failure s occtir re di n th e -threade dsectio n p f th e bolt . I t

i s ou r understandin g tha t th e lates t

productio n bolt s hav e Increase dwal l thickness . Hftrwever, w e hav e no t

see n an y dat anotiiyjLn g th e operator s o f a n iiqprove dthr u bolt . 7 . Als o bein g sen t

t o yo u un<lerseparat e cove r is. afue l tube,assentol y renove dfixj mTI0-5^0-A2 B mode l engin e S/ H L-II9O-6 I du e t o chafin g cause db y loos e fi t

clamp . Bi e P/ N 7203 7 claiq * wa s installed-i n coa plianc e wit hA

D Not e 71-13-1 . Yo u wil l recal l tha t w e hav e discusse d -thi s proble mbefor e an da n imrestigatlo n reveale dtha t thi s conditio n wa s possibl e du e t o th e clan p toleranc e an dtha t th e kit s tiupplie di n •th e futur e wil l hav e claiip s tJia t vi U provid e atigh t fit . A s yet , n o RGCOVEO n 

# f^ ^ JA N 

# 3 197

2 LYC177 5m^l m 

# - r

2 

# I servic e instructio n o r buU.eti n ha s bee n issue db y Incomin g t o requir e th e operator s wh

o hav e congplie dwit hA D 71-13- 1 t o inspec t th e fue l line s fo r chafin g an dtightness . 8 . Als o include dar e MorD'' s coDcemln g cylinde r bea dcracking , cylinder , rin g failures , exhaus t valv e failures , turbocharger . whee l robbin g an d throttl e ar mcracking . W e woul dappreciat e you r comment s i n regar dt o th e abov e items . A pack ag e i s bein g forwarde dwit hacop y o f thi s lette r

an dwil l includ e th e following : •

Quantit y Par t - Mor D Repor t 1 Fue l tub e assembl y 1130100 1 k Engin e nount s (P/H697OI ) 1209100^- 3 1 A

C oi l filte r

thr u bolt . I213IOI 9 1 A

C oi l filte r

rubbe r gaske t 1213102 5 1 Mixtur e contro l ar massembl y 1126107 2 « 1 Vacuumpusi p drivegea r assenbl y 3202100 2 JJO^UJU J 

# It - iKfO^MJtM^

I (\C . H . SHEENE Y (^lief , Propulsio n Section , EA-21' ^ Bnclosure s



# £ % y ^ LYCI77 6

# D r DEPARTMEN TO F TRA I ^/ORTATIO M 

## FEDERA L AVIATIO N ADMINISTRATIO N DAT t 1. 3 Otr : i97 2 Ri^TO : AEA-21 4 EASTER N REGIO N PCOCRA L BUIU>IH S . JOH N F . KCNNEO V tNTCRNATIONAt . AllirOli r JAMAICA . Ne wVOA K1143 0 

## sMxct : Throttl e bod y t o bow l scre w loosenin g - Lycomin g Or32 0 series . engine s N^istt j Avc o Lycomin g Divisio n Avc o Corporation.'^

—^— ^ Attention : Hi^^^l , Hollan dJ] >

Speclliisatlo aEngl.net o Wllllsmaport , Pennsylvani a1770 1 - - - THI S DOCUMEN TAN D TH E INFORMATIO N CONTAINE D HEREI N I S TH E fflOPeRTT Y O F LYCOMIN a ATEXTRO N COMPANY . AN Y REPRODUCTION . DISCLOSUR E O R US E THEREO F I S PROHIBITE D EXCEP TA S AUTHORI^ D I N WBrTIN Q B Y lyCOMlNQ . RECIPIENTACCEPT S TH E RESPONSIBILIT Y FO R MAINTAININ Q TH E CONnOENTIALrr Y O F TH E CONTENT S O F THI S DOCUMENT .



# : f 

# ) Thl a refer s t o ou r lette r date d 1 3 Augus t 197 1 concernlia g Mplfiinctio n o r

Defect s Report s receive d fro m th e field . Liste d I n the . lette r wer ^ 1 6 incident s o f throttl e bod yt o bow l scre wloosening s o f Harvcl . Scheble r MA4S7 Acarburetor a ihstalle d cr n Lycomin g modie l 0-32 0 aerie s engines . Durin g a meetin g a t you r facilit yo n 2 0 Januar y1972 , w e advlae d tha t . Malfunctio n o r Defec t Report s o f throttle'bod yt o bow l scre w loosening s ar e stil l bein g received . Tov i wer e als o Informe d tha t althoiij ^ the . majorit yo f th e incident s repcirted occurre d o n Lyciomin g 0-32 0 E2 D engine s installe d i n Cessn a 17 2 mode l aircraft , Ineldent a o n Lycomin g 0-32 0 aerie s engine s installe d i n Pipe r aircraf t wer e ala o included . A t tha t tia e w e wer e tol d thes e report s wil l b e forwarde d t o your.Iiiatallatio n Engineerin g Sectio n fo r thei r investigation . A s a resul t o f th e Investigation , thi s offic e was.-notifle d verball ythat . I n regar d t o th e Cessn a installation , i t wa a dejtermlned tha t th e airbo x whic h attache a t o th e Marve l Scheble r carbureto r l a no t sufficientl y supporte d and tha t Ceasn a Aircraf t and Marve l Scheble r wer e mad a awar e o f you r findings . However , a a ye t ther e hav e been.n o Instruction s issue d b y Cessna , Marve l Scheble r o r LycOmin g t o correc t thi s problem . PUrther , we ar e no t awar e o f anyactio n i n progrea s t o correc t thi s problem . T o date , w e hav e forwarded't o you r offic e 4 5 Malfunctio n or-Defec t Report s o n thi s subject . I n th e pas t monti i 4 additiona l report s wer e received . Fo r you r convenience , w e ar e enclosin g copie s o f al l Malfunctio n o r Defec t Report s receive d o n throttl e bod yt o bow l acre wloosening . Pleas e revie w thes e report a ani d provid e comment a t o thi s offic e a s t o any actio n yo u ma ypropos e tha t wil l hel p i n alleviatin g thi s problem . I t i s suggeste d tha t a maximumpermlsalbl e overhan g momen t fo r attad|Mwnt s t o th e carbureto r b e laad e availabl e t o appropriat e alroraft - mannfacttiirers . Als o t o preclud e th e possibilit yo f futur e incidents , w e ar e considerin g periodi c inspection s o f th e throttl e bod yt o bow l screw s fo r loosenes s b e mad e mandatory .

reclate.you r promp t repl yt o th e above . 

## C . B . SWEENE

Y Chief , Propulaio n Section , AEA-21 4 Enclosur e 

# CONFIOENHA L SNSJcnj:>: s 

## DE C 1 8 15372 .

iLYC178 0

# r.. .

> ' 

# r V y i AR V E L - S C H E B L E R PRO D U. C T S D I V I S I O N r ^ »OtC.WAlH» l COitOtATJO M btCATUI . IlltNOi S 

# ' ^ Januar y 19 , 1962 . 

# r. • 

# r p . 

# r. rr; ) 

# r" 

# r r r

# r 

# r

i 

# r Continenta l Motor s .Corporatio n

20 S Mei'ltc t

Stree t >Sj5V:egon , Michiga n Attontion : Hr . Ray J . Fend , Servic e Manage r GcntlcTen i Hr . Joh n J . Lj"nes3 , Manufacturin g I:ispector , Federa l Aviatio n Agency , Engineerin g an dK4:rdfact«rln g Distric t Orfic c CE-lil , P.O . Bo x 538 , IMsicegon , Mchi^an , has . requeste dtlia t v e submi t

arepor t

o n cu r flndlns s o n *>'

o IJivestigation ao f

.-njilAunctic n wit hMarvel-Scheble r aircraf t carfcuretere , Th s ccrburete r

p:u^.. s an ddat apertinen t t o th e investigatioh awere : • submitte db y ou r

Kr . Clau dDuBois . Ou r Inveatii^ation s o f

th e part s i n questio n ar e reporte dseparatel y an d ar e nncloscd . Sine s thi s repor t

vis s receive dfro mKtr . Du.?ois , w e hav e investigate da oorvic e ccnplain t

tha t ma y hav e sorw

abearin g o n th e proble mo f ou r prlcur> ' ventur i woricln g loos e causin g engin e operationa l malfunctiorj . Capito l Aviation , Inc. , Springfield , Illinois , reporte daroug hengin e cpsrctio n o n aCessn a17 5 airplan e vit htota l tim e o f 7U 9 hour s o n th e onsino . Caa^burcia r

Mode l IU-li- 5 lO-ld?! . fjZZ ^ 'XJ^M<-% . ISL , D LW" V E-xanin."vtic n o f

th o engin e reveale dtha t th o carburete r

fue l bow l wa s loo:: e o n th e throttl e body . However , th o bow i ocrew awit hthe . safet y vcohcr s wer e etil l Intact . Th e carltrurctc r wa s take n apar t

an dth e prlnar y ventur i vii o foun dt o b aIcoa o wit hth e ventur i retainin g clip s ioisaing . Ther o va aevidenc e o f wea.T o n th e throttl b bod y unde r th e scretto . Th o ai r bo x wi dth e exhaus t syste mo f

th e aircraf t

wer e chocke dan d i t vas-roto dtha t

ther e i s a n exhaus t manifol dstac k

brac e secured-t o th e rrithe r

lon g ai r

inductio n scoop , whic hi s ^tache dt o th o bas e o f th o carburote r

I'uo l boul . Vi

e believ e tha t

thi s brac e a o attache dca y fca•ir;:ij:forrin' j tarnoni c %-lbration s froi ath o oxhau.<) t t o th o carburete r an dthereb y enurin g rapi dv:oa r throughou t

th e carbiirotcr . 

# I 

# F ^

# Continenta l .Sotor o Corp . - 2 - Januar y 19 , 19(52

I Mr . Ka

y J . Fanc l

'.7e feo l tha t

thi s conditio n warrant s furthe r investigation , an dtrus t thia . infonuitio n vfll l b ac f valu r t o yo u o n thl « isattor , Tour s ver y truly . 

# ^•^^'M^xrZii! ^ Donal dK . Grahaf

i DKGtj. o Projec t Enginee r Attschiunt o cc : >U)Bsr9 , Tau l Zberl y CM C R.J . Powel l " . Everet t Funne l " a . T ; M.^sso

y M- S

. - F . W . Hidde n " i ) ClcU Q DuBci a" *^^^ - ' . Keit hBlyth o FA A

( ) 

# y ^

# r r J—- . 

# r I 

## i

t 

## I 

# r r r r n r f r 

# r i r rr\ ^ ^



# f\ 7 APR

## 137 2

y:-3l 4 LooBcr.in g o £bcw l sctec b fcrev ao n I^A4« 5 carburvtor s Mr . a . 11 . Littl e , Marvel-Scheble r

Product s Divisio n Bcr.^-Uurnc r

Corpor/icio n 219 5 Cout hEljil n Roo d 17«cetur , Illlool a6252 5 W o hiv o receive darepor t ,o i th e subjec t

coodltlo n vhlc hprogrease dt o t h e puln C o f

fuci l Icukag e « t

th e piurtlr.g-line . A cop y o t th o report , ou r iiimwc- r 01162010 , I s cncloeu dfo r yow f loformaclon . W

e believ e th e outhc r o f th e v-pcx c ha

minlstclxnl y assuae U ch « coadlelo n wo n du e c b t h e P/t t 7fl-A9 7 cu b i.r.zlir-ra . V e btillev e th e proble mI s ^u e c 6 ca t I n . t h e bsw l c c boti y :;r.t;i!d t whic hrcliove s Ch « ccr(;u « o n Che acrew s an d Iioi'r.ic e tJ> o bc-u l C o tecv s reUclv o t o th e bori y du e to-engin e vibratlba . \*hl s cnuce i th e w.-ishcr s t o veo r Int o .th e body , thu s furthe r loosenin g Ch e acrcv* . rn dcccelcratln athl aprocess . K c dci:b £C>in

C Ch e fue l Ic^kec * vioul dcreat e asexlou afir e hat^rd . U<r.>evcr , th e carbureto r calibratio n an dengin e operatio n coul db « odv.^rscl y cisactcii . .'cccrtilrniy . v e woul dvpfreclot ayou r rovlcwln ath e sultcblltt y o f list s r.r.aKc t

ir. r th e vcvircirisen t

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I N CLOSE D POS N FOUN D UNKAG E WOR N BET>yEE N BUTTERFL Y + ACCE LPUM P 10489 4 PRI M VENTUR I CARB DEFORMED , INSP/IHAIN T OTHE RNON E19790402000S 7 CESSN A A160 M CONrO200 A 732 2 FUELCONTROL/CARBURETO RFACE T MA3SP A ROUG H EN Q AN D POWE RLOS S APPEAR S A S I FFIR EI N AIRBO X AN D MELTE D PRIMAR Y VENTUR I A160098 7 2ff2861A4 8 N2787 J

20 6 20 6 UNIVARA2AL0 N CONTC9016 F A« 5 4839161 6 N6S65 Q A3075 9 FLOA T CAR B BOW LRUBBIN G CLIM B OTHE RUNSCHE D 197610140001 9 W 84 0 7322 . FUELCONTROL/CARBURETO RMARVELSCHE B MASSP A Q6168 4 84 0 EN GLOS T POWE RSHORTL Y AFTE RTAK E OFF.FOUN D ON ESID E O FFLOA T RUBBIN GO N CAR B BOWUAL LAD S C- W A43A3 3 VENTURI : PRIMAR Y TAXI/GRN D FLAM EOTHE R WOTHE R .734 2 FUELCONTROUCARBURETO R DISTORTE D I977O4180OO6T UNIVARA2AL0 N C0NTC9616 F A1&3 48912 ° MARVELSCHE B MASSP A Q6173 2 N6653 F 76 7 76 7 R R E I N INDUCTIO N SY S O N STAR T DU EOPRIME.1NS PREVEALE D CAR B PRIMAR Y VENTUR I BADL Y HEA T DISTORTHT D STRIPPE D 197609230003 2 UNIVACGCI B

CONTO300 / 117 2 160269A R N41W W CAR B BOW L CRUIS E VIBRATIONffli u UNSCHE D WOTHE ROTHE R0 732 2 FUJB LCONTROL/CARBURETO RMARVELSCHE B MASSP A &P14349 9 .78 2 ROUG H RUNNIN GEN GRESULTE D I N UNSK D LPG,FOUN D TH E4 SCRJE WHOLE S HOU)IN GCAR S BOWL^TRIPPE D 2064 8 N7726 K 6242 1 l]/30« 7 .



## 6 3966766R L0 PILO T REPORTE D INTERAUTrEN T ENGIN ERDUGHNES S AN D LAC K O FPUL LPOWER . THROTTL ELATE RJAMME D I N IDI E POSmON . FOUN D CARBURETC mPRIMAR Y VENTUR I DISLODGE D AN D JAMME D BETWEE N THROTTL EPLAT EAN D MAI N DISCHARG E NOZZLE . 46A3 3 . CRUIS E 4 732 2 VENTUR I CARBURETO RWOR N

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MIXTUR ECON T CABL EBROKEA T LEVE RATTAC H O N CARB . CABL EHA D FATIGU EWOR K HARDENIN GFRO M AG EAN D USE . Printe d Apri l 02.0 4 Paget S 

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198209280002 9 CESSN A 172 M LYCO320E2D 17126754 1 N7356 2 13IS2 1 CRUIS E 4 • 732 2 FUELCONTROL/CARBURETO RM/IRVELSCHEBMA4SP A .CK51034 1 2 0 CARBTHROTTLESHAFTSEIZEbATJDLEINFLT . FOUNDSHAFTGALLEDATBR G AREA . 144 7

22966 0 TUB E AC C DIS C CARBURETO RLOOS E CESSN A 172 M 1727313 7 N85ER . INSP/MAIN

T OTHE

RNON E 198212200002 5 LYCO320H2A D U8397 6 * . 0 732 2 FUELCONTROUCARBURETO RMARVELSCHE B MA4SP

A 40 8 ACCELERATO

RPUM P DISCHARG

E TUB E SHEARE

D A T WAL L O FCAR

B TOROAT.FLEET INS P FOUN D 6 OTHE

RCAR B WIT H LOOS E DISCHARG

E TUBES . INSP/MAIN T 732 2 BOW LCAR B

FLUIDLOS S NON E FUE LCONTROUCARBURETO R FOUN D CAR B BOVV

LSCREW S LOOSE . 3076 S NO T 4 • . T32 « FLOA T

OTHE RNONf c FUE LCONTROUCARBURETO R SEPARATE D 19830801000S B

SINK S 198a080600i n CESSN A 172 M LY C OS20E2 D MARVELSCHE B MA4SP A CESSN A 172 M LYCO320E2 D FACE T MA4SP A 1726677 2

1726596 2

EN GWOUL D NO T IDLE , FLOODING . INS PFOUN D CARB.FLOA T + LEVE LASS Y WOUL D NO T FLOA T I N GASOUNE . 3076 9 INSPMAIN T 4 732 2 FLOA T

FLUIDLOS S - NON E FUE LCONTROUCARBURETO R CAh B LEAKING . FOUN D FtOATSUNK . INSP/MAIN T SHAF T AR M SID E

OTHE RNON E OVERWEIGH T 198404050001 0

GALLED/nOH T 198406110000 8 CESSN A 172 M LY C O320E2 D FACE T MA4SP A CESSN A 172 M LY C O320E2 D 6467 2 L4090527 A CK1198 3 1726313 5 L4036827 A N9688 Q

0 N9I3t H 200 0 200 0 N6160 7 126 1 I26 I N4386 R 4 0 732 2 FUELCONTROUCARBURETO RFACE T MA4SP

A BL201064 2 . « THROTTL

E SHAF T GAULE

D * TIGHT I

N AR M SID E BUSHIN G 6 HR S AFTE RO/H : BUSHING S NE WAh D REAME

D WIT H MF C TOOUP/NMlO a A3075 9 : FLOA T INSP/MAIN

T FLUID LOS S NON E 4 . 732 2 . FUELC0NTR0L«i4RBURET0 R CAR B LEAKIN

G FUE L FOUN

D FLOA T OVERWT . FUELSOAKE D 198406130000 9 CESSNA 172 M LYCO320E2 D MCAUL Y 1C160DT

M FACE T MA4SP

A 1726431 0 N8954 V 40O4927 A 72551 9 163 4 . CKI129 5 163 4 

## Printe d Aprit02.0

4 ' '

• A n airsafety.co m Produc t " ^ Pag e 1 3 nepore d Fro m Omcto/FA ARecord s By : 

## A i rDiat a Researc h 986 5 Towe rView . Helotes . Texa s 7802 3 210-695-2204-Fa x210-695-230 1 into@airMlely.co m - wv\n»v.airsalet y.co m Copyrigh t 1999,200 4 Af rDat a Reseaid i

AIFS^ * Reserve d 

# 1 %

# ( ) Par i No . Por t Nom e StogeOpn s Nohir e o l Con d1 Severil y Natur e o l Con d2 AT A Cod e AT

A Tex t Remoric s 3076 9 FLOA T INSP/MAIN T OTHE R 

### 4 PortlocoHo n Por f Conditio n PrecProc ] RplCMNo . Pre c Pro c 2 Operoto r CARBURETO RWIGHB D HEAV Y NON E198408200001 2 732 2 . FUELCONTROUCARBURETO R EN GFLOODIN GA T LO WRP M FOUN D FLOA T OVE RWEIGHT . 16B7 8 GASKE T TAXI/GRN D OTHE R 4 FLUIDLOS S BOD Y TO LEAKIN G NON E198411090006 4 732 2 FUELCONTROUCARBURETO R AcH/Mfr/ZHd l En g MIr/Md l Pro p MIr/Md l Cnv l MIr/Md l CESSN A 172M LYCO320E2 D MCAUL Y 1C160DTM FACE T MA4SPA CESSN A 172M

. LYCO320E2 D MCAUL Y 1C160DTM FACErrMA4SP A Acf l S N • . EngS N PropS N CmplS N 17264240 . L3987027 A 72561 2 ; . CKUI3 9 1726397 8 L39i482.7 A 72506 9 CK48176 : AdlRegNo .

Oitnc«ll y Dot e Tolidlin M llm*«nceO/ H M88B1 V 107 8

. 107 8 N60L M 

### 0 • 36 2 BN O WOUL D NO T SHU T DOWN WIT H MIX T I N IDL ECU T OFF . POUN D FUE LRUNNIN GOW TA T BOWLT O THROTTI B BOD Y MATIN GSURFACE ; 16B7 0 GASKE T TAXI/GRN D OTHE R 4 FLUIDLOS S BOD Y T O LEAKIN G NON E19841109000( 6 732 2 FUELCONTROUCARBURETO R CESSN A I72 M LY C O320E2 D MCAUL Y 1C160DTM FACE T MA4SP A 1726672 6 L447Z627 A <X9&$ a N80761 .



### 0 28 9 EN GWOUL D NO T SHU T DOW N WTT H MIX T I N JDL ECU T OFF . FOUN D FUE LRUNNIN GOUT'A T BOW LT O THRO t BOD Y MATIN GSURFACE . 9580 9 SCRFX N CUM B PARTIALRPM / UNSCHE D 4 282 0 FUE LDISTRIBUTIO N FUE LSTARVATIO N OCCUR6 D DURIN GCUMBOUT . CONTAMINATE D CESSN A I72 M 1726711 4 N1447 U 198509270004 3 LYCO320E2 D L4606227 A

..... . 1*7 4 . FACE T MA4SP A .127 4 FOUN D Jjyr r

INSID EO FFUE LINLE T SCREE N A T CARBURETOR . 

# if ) SCREW S PARTIALRPM / GASKE T UNSCHE D LOOS E

108512050014 9 CRUIS E 4 • 

### 732 2 FUELCONTROUCARBURETO R FOUN D CARB LOOS EA T PARTIN GGASKET - CAUSIN GROUG H EN GOPER . CESSN A 172M LY C O320E2 D FACE T MA4SP A 1726388 0 N2095 2 108609 M 0

80 0 A1036783 2 FLOA T CAR B BOW L CRUIS EVIBRATIONm U UNSCHE D 4 PARTIALRPM / 732 2 FUELCONTROUCARBURETO R SATURATE D 198601270004 4 CESSN A 172M

LYCO320E2 D FACE T MA4SP A 1726251 1 N1311 9 L35512'> A 01/13A 6

169 0 169 0 PILO T STATE D EN GBEGA N T O RU N ROUGH , COUL D NO T RESTOR EPOWER . MAD EEMER GLANDINGI N FIELD . MAlN t PERSONNE LFOUN D PLA S TI C FLOA T I N CAR B SATURATE D WIT H FUEL . 3076 0 FLOA T TO O HEAV Y CESSN A 172M . 1726621 9 N6442 7 TAXI/GRN D FLAM EOTHE R198605070002 8 . LYCO320E2 D Oan* M 4 • ' • . . O . 

### 732 2 FUELCONniOUCARBURETO RFACE T MA4SP A CK172 6 0 ENGIN ECOMPARTMEN T FTR EOCCURE D WHE N ENGD4 EFAILE D T O START . CAKB WA S DISASSEMBLE D F<> ROVEMIAU LAN D FLOA T WA S WEIGHE D INATa. 6 GRAMS . 8 0 8 7 FUE LWA S BEIN GUSED . NORMA LFLOA T WEIGH T I S 1 7 GRAMS .

FLOA T FLOODIN GCESSN A 172 M 172iS22 S . N6448 8 INSP/MAIN T FLAM ENON E198606290001 7 LYCO320E2 D L4168027 A •4a8« 6 4 • • . . ' 0 . • • • 

### 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A . CKli41 7 . 0 AIRCRAF T HAi

S HA D AUT O FUELST O FO RAPPROXIMATEL Y ON EYEA RHAD . BEE N HIGHLYSUSCEPTIBI^T O FLpODIN G AN D EXPERIENCE D EXC ESSIV EFUE LCONSUMPTIO N RECENTLY . VER Y DIFFICUL T TO STAR T WHE N HOT . CARBURETTOR SERVIC EBULLETI N NO T COMPLIE D WITH . DU RIN GSTAR T ATTEMP T WHIL EHOT . INDUCTIO N HR ESTARTE D WHIO l CAUSE D DAMAG E T O HOSE S AN D WIRE S FORWAR D O FFIREWAL LCARBUR E TO RHA S NO T BEE N DISASSEMBLE D AN D 

### INSPECTE D B Y SUBMITTER . BlfT SUBMITTFS ISUSPECT S FLOA T PROBLEMS .



## A n airsafety.co mProduc t Prepare dFro mCm d Printe d Apri l 02.0 4 Pag e 1 4 rtiool FA ARecord s By : 

# Ai r Dat aResearc h 986 5 Towe rView . Helotes . Texa s 7802 3 210-695^220 4 - Fo x21(W95-230 1 intoOoireately.co m - www.oiiSQtety.co m Copyiigli l 1999,2004 Af rData Researc h

AlFtiglilsReteive d —iQ .

# V)

( ) PortNo .

Sing e Opia . Seveit y AT ACod * Remoric s . Port Nom e

Nolur e o f COn d 1 Nolur e o i Con d 2 AT AText Portlocolo n Pre cPro c1 P»e cPro c2 Par

t Conditio n RplCMNo . Operato r Acf t MIr/Md l EngMK/Md l Pro p MIr/Md l Cinp t Mfr/Md t AdIS N EngS N PropS N Cir*ilS N AcNRegNo .

DWcutlyOal e Tota l Time : TimeSince-O/H . LS441I27 A 06/20i9 8

100 6 7aU10 . LOC K TA B CARBURETO RFAILE D CESSN A 172 M NO T . OTHE ROTHE R199810090030 9 LYCO320B2 D 4 • • 732 2 . FUELCONTROL/CARBURETO RMARVELSCHEBMA4S.P A . . 0 ' • (CAF ^ PILO T WA S UNABL ET O SHU T DOW N TH EENGINE . INSPECTIO N O FTH ECARBURETO RPOUN D TH E LON GLO K TA B WASHER S O N TH E SXFETY . SCREWS . THA T SECUR ETH EFLOA T BOW LTO.THECARBURETO RBODY , HA D FAILE O ALLOWIN G THE.MIXTUR E VALV B T O SEPARAT E FRO M IT S RECEPTACLE. , SUBMITTE RSTATE D CANADU N AIRWORTHINES S URECrnV E .(AD)'<7-«3:9;wlfl<^>lU!roAT ^ MARVE LSCHI ^ ' BEQUIRE D TH ESAFET Y SCREW S T O B E LOCKWiRED . " • " ' J MA4SP A NOZZL E CARBURETO RSEPARATE D CESSNA.172 M CRUISl E OTHE RENGIN E199g01290«21 4 ' LYCO320E2 D 40652127 A 07/095 8 4 MCAUL Y iClOdDT M KD02 8 0 7Ji2 2 FUELCONTROUCARBURETO RFACE T ' BL20993 1 0 <CAN) ENGIN E JPOWE RQOUL O NO T B EREDUCE D BELO W230 0 RPM , TH E THROTTL EAPPEARE D TO B ESTUCK . O N TH E ADVIS E OFT11 ETOWERAr mGROUN D STAFF . TH EPILO T SE T U PA N APPROAC H AN D ONC ELANDIN GWA S ASSUREDTH E EFKJIN E WA S SHIJ T OF FB Y SETTIN GTH EMIXTUR ETO IDL ECUTOFF . THI S WA S EXECUTE D AN D A N UNEVENTFU L LANDIN GWA S CARRIE D OUT. . POST-FUGH T INSPECTIO N FOUN D TH E CARBURETTO RACCELERATO RPlAf PDISCHARG E NOZZL E HA D SEPARATE D FRO M TH EPUM P AN D JAMME D TH EBUTTERFLY-VALV ECAUSIN GLOS S O FTHROTTL ECONTRO U MA4SP A FLOA T BOW L. CARBURETO RLOOS ECESSN A 172M . 1726289 1 N1362 8 NO T PARTIA LRFM/PW ROTHE R19991218000S 3 LYCO320E2 D M723127 A I0Q7<9 9 4 • • 0 • 732 2 FUELCONTROUCARBURETO R7 6 PILO T REPORTE D ENGIN E WOUL D NO T IDLE . REMOVE D COWLING . FOUN D FLOA T BOW LLOOSE . THREl B LOC K TAB S Mli^NC . TH E FOUKT H LOC K TA B CRACKED . AL LBOLT S .VER Y LOOSE . ' ' " ' ' ' SCRE WCARBUREn'O RLOOS ECESSN A 172M 1726120 8 N2034 5 INSP/MAIN T OTHE RNON E 200001080060 1 LYCO320EZ D L3281127 A 12/17S 9 •*; . • • • • 0 •- • 732 2 . ..FUELCONTROUCARBURETO RFACETMA4SPA1052 n DC3612 . 132 0 DURIN GSCHEDULE D INSPECTION , CARBURETO RTHROTTL E BOD Y T O BOWLSCREW S WER EFOUN D LOOSE . REMOVE D FRO M ENGINE . INSPECTIO N REVEALE D N O FURTHE RDEFECTS . NE WGASKE T AN D LOCKIN GTAB S INSTALLED . CAUSE ; POSSIBL E GASKE T SHRINKAG E O RUNDERTORQU EOFSCREWS . SUSPEC T GASKE T SHRINKAG EA S LOC K TAB S WER EBEN T TOLOCKSOIEWS . 3080 4 FLOA T FUE LDAMAGE D CESSN A 172 M INSP/MAIN T OTHE RNON E200109060009 0 LYCO320EZ D 4 MCAXILYIC160DT M 732 2 FUELCONTROUCARBURETO RFACCTMA4SP A (AUS ) CARBURETTO RFLOA T CONTAMINATE D WIT H FVE LCAUSIN GCARBURETTO RTO FLOOD . 22966 0 TUB EACCELERAT O LOOS E INSPMAIN T OTHE RNON E198006260004 7 4 - • ' 732 2 FUELCONTROUCARBURETO R bimiN GINS P FOUN D ACCELERATO RPUM PDISCHARG ETUB ELOOS & 229560 ' INSP/MAIN T

. 4 . 734 2 22956 0 INSP/MAIN T 4 732 2 TUB E ACCELERAT O

OTHE RNON E FUELCONTROUCARBURETO R TUB EACCEIJilRAT O OTHE RNON E FUE LCONTROL«ARBURET0 R LOOS E 19800625000 « ' LOOS E 198006260004 9 BL l 9863 6 CESSN A 172 N 17269521 . LYCO320H2A D L23847 6 MARVELSCHE B MA4SPACKS860 6 CESSN A 172 N 1726956 9 LYCO320H2A D U4337 6 MARVELSCHE B MA4SP A CK61136 8 CESSN A 172 N 1728962 3 LYCO320H2A D L23437. 6 MARVELSCHE B MA4SP A 201002 0 08/22A 1 0 16 3 N27E R 0 96 9 N40E R 0 41 8 N2iBE R 0 124 5

PrMe d /^pril02.0 4 Pag e 1 7 210-695-220 4 

## A n airsafety.co m Produc t Prepare d Fro m Ofncio ) FA ARecord s By : 

# Ai rDat a Researc h 986 5 lowe rView , Heloles . Texa s 7802 3 ' Fo x210-695-230 1 inlo@oirsolety.co m - www.oirsatety.cor a Copyrigh t 1999.2004 Ai rDat a Raseard i

A l Right s Reserve d



## \ ^ :

# n PortNo . Por t Nom e Stag e Opn > Natur e o l Cori d t Severit yNatur e o l Con d 2 ATACode . AlATex l Reiriart U Portlocatb n PortCondRto n PrecPrec l RplCMNo . Pre cProc . 2 Opeiolo r. AdlMir/IMd l EngMtr/JMd l PropMtr/)Md l Cmp I Mfr/Md l AcllS N AdlRegNo. . EngS N DRncoMyDol e Pro p SI f Tota l lim e CmplS N Time.Sinc e O/ H 10501 8 BOW LLOOS ECESSN A 172 N 1726801 5 N'>687 9 NO T . OTHE RNON E198102230021 1 LYCO320H2A D RL4477 6 4 . - :1<*2 - 732 2 FUELCONTROUCARBURETO RMARVELSCHE B .CK3496 o l45Z . CAR B BOW LHOUSIN GLOOS E ORIGINA LLOC K WASHER S STTLLI N TACT.EN GWOUU ) SHU T OFI FWIT H QHL X MINtMA L CONTTtOLMbVEMEiN T • , , . : . - . . 229S6 0 TUB E AC C DIS C CARB MISSIN GCESSN A 172N - 1727144 5 N87E R INSP/MAIN T INADEQUATE Q NON E 1981030200163 . . LYCO320H2A D L23417 6 4 •".•'' ; O'. - 732 2 FUELCONTROUCARBURETO RMARVELSCHEBMA4SPA ' CKT14442 . '47 4 DURIN GMAIN T TH E ACCELERATO RDISCHARG ETUB EWA S MISSIN GFRO M CARB THROAT . CARB THROA T MISSIN G NON E~ 198104010006 0 229G6 0 TUB E DIS C INSP/MAIN T OTHE R, 4 732 2 FUELCONTROUCARBURETO R DISCHARG ETUB EMISSIN GFRO M THROA T O FCARBURETOR . CESSNA172 N '7314 0 N92ER . LYCO320H2A P. L21917 6 . . • .,38 8 MARVELSCHE B MA4SPA.CK8i.622 l 388 ; 46A3 3 VENTUR I NO T VIBRATIONm U 4 WARNIN GIND I 732 2 FUELCONTROUCARBURETO R CARB THROA T DAMAGE D NON E 19810609000( 0 CESSN A 172 N 1727Q36 6 N73aZ K LYCO320H2A PL33237 6 MARVELSCHE B MA4SP A CK4937 r 121 4 EN GLO WO N POWE R+ ROUGH . HUMAR Y VENTUR I MISSIN GFRO M GARB . POUN D VENTUR I I N N O 4 INTAK ETUBE .

BOL T WARNIN GIND I THROTTL E NON E LOS T

1981O7226OO9

0 CESSN A 172 N LYC0320H2A O APPROAC H

. , " - 4 • ( ) 760 3 POWERLEVE RMA4$P A

TH E BOL T ATTACHIN GTHROTTL E T O CARB FEL LOU T DURIN GLANDIN GAPPROACH . RL36387I T N6410 F 119 5 .119 6 13162 1 SHAF T VALV E THROA T WOR N INSP/MAIN T OTHE RNON E198108110008 0 4 732 2 FUELCONTROUCARBURETO R EXCES S /UCIA

LPLA Y I N CAR B THROTTL EVALV E 3^ 2 TO 1 « INCH . CESSN A 172 N LYCO320H2A D 1727091 7 L44647 6 MARVELSCHE B MA4SP A CK51091 7 N789Y R 100 0 100 0 6026 0 BUSHIN GTHROA T WOR N INSP/MAIN T OTHE RNON E198108110008 1 4 732 2 FUELCONTROIA^ARBURETO R EXCES S AXIA LPAL Y I N CAR B THROTTL E VALV E 3/3 2 TO 1/ 8 INCH . CESSN A 172 N

LYCO320H2A D 1727091 7 L44547 6 MARVELSCHE B MA4SP A CK6I091 T NTSSYR 40Q 0 100 0 13162 1 SHAF T VALV E THROA T WOR N INSP/MAIN T OTHE RNON E198108110008 2 4 732 2 FUELCONTROUCARBURETO R EXCES S AXIA LPALY I N THROTTL E VALV E SHAF T AN D BUSHINGS . CESSN A 172 N LYC0320H2A D 1726996 7 L2S867 6 MARVELSCHE B MA4SP A CK48659 : N738a N 192 0 59 6 6026 0 BUSHIN GTHROA T WOR N INSPMAIN T OTHE RNON E198108110008 3 4 . • 732 2 FUELCONTROUCARBURETO R EXCES S AXIA LPLA Y I N THROTTL E VALV ESHAF T AN D BUSHINGS . CESSN A I72 N LYCP320H2A D 1726996 7 L28867 6 MARVELSCHE B MA4SP A CK4866 6 N73SG N 192 0 99 0 

# ( I Printe dAprl02.0 4

Pag e 1 9 

## A n airsafety.co m Produc t y n Officia l FA ARecord s By : Prepare d Fror n 

## A i rDat a Researc h 986 5 Towe rView . Helotes . Texa s 7802 3 210-695-220 4 - Fox210^95-230 1 inioOoltsolety.co m - www.airsoiety£b m Copyrig M 1999.200 4 Af rDat a Researc h

AIRigM s Reserve d 

# \ ^ -

# K por t No . Stag e Oprt s Severil y ATA<:od e Remoric s INSP/MAIN T 4 732 2 N O TEX T Par

t Nam e Natur e d Con d 1 Natur e d Con d 2 AlATcx I TUB E OTHE R Por t locoRo n Pr* cPro c1 Pre cPro c2

NON E FUELCONTROUCARBURETO R PortCondilio n RplCMNo . Operdo r MISSIN G AcllMlr/M d Ehg/Mtr/Md l Pro p MIr/Md l CmplMk/M d CESSN Al72 N LYCO320H2A D ActlS N Eng« H PropS N CmplS N 1726867 3 MARVELSCHE B MA4SP AC23597 0 A d l Re g No . OmcdIyDdl * Tota l nm e • Tim e Sinc e O/ H M46E R 18 8 18 8 VENTUR I WARNIN GIND I CARBTHROA T BROKE N NOFff i 1981081400076 . CESSN A 172 N 1727071 4 N739Q E NO T WARNIN GIND I NON E 1981081400076 . LYCO320H2A D L463S7 6 4 • " ff • • 732 2 FUELCONTROUCARBURETOR - MARVELSCHE B MA4SP A 1063 3 0 POWE RLOS S DU E TO BROK E PRIMAR Y VENTURI . VENTUR I INJESTE D I N INTAK E MANIFOLD .

• ( ) SHAF T CARBURETO RWOR N

iNsPMAirr r

OTHE RNONE . I98IO83IOOO » 

### 4 732 2 FUELCONTROUCARBURETO R CAR B THROTTL ESHAF T HA D EXCES S AXIA LPLA Y a0 2 TO U 8 INCH . 22966 0 TUB E DISC . BARRE LSEPARATE P CRUIS E WARNIN GIND I NON E 198110280009 6 4 AFFECTSYST E 732 2 FUELCONTROUCARBURETO R CESSN A 172 N LYCO320H2A D . 1727091 7 L44547 6 MARVELSCHE B MA4SP A CK61091 7



## . - CESSN A 172 N LYCO320H2A D MARVELSCHE B MA4SP A •I727I29 0 UT307 6 CK81621 7 N7S9Y R

.100 0 100 0 

## * N21E R 

### 78 6 78 6 TH E PUM P DISCHARG E TUB E SH>ARATE D FRO M BARRE LWAL LAN D LODGE D BETWEE N THROTTL E BUTTERFL Y + BARRJEa . JAMMIN GTHROTTLE . 2217 6 HOUSIN GLW RCAR B CRACKED . NO T FLUIDLOS S NON E 198111120006 0 7322 ^ FUELCONTROUCARBURETO R TH E FLANG E CRACKE D O N HOUSIN GPUM P INLET , O FCARBURETOR .

SCREWS - BUTTERFL Y LOOS E NO T AFFECTSYST E NON E 198206290005 4 CESSN A 172 N LY C O320H2A D MARVELSCHE B MA4SP A CESSN A 172 N LYC0320H2A D 1726916 1 L17707 6 666 0 1727325 1 L70327 6 N734V Z

25 1 25 1 NT3S8 F 4 . 100 2 732 2 FUELCONTROUCARBURETO RMARVELSCHEBMA4SP A CK71S95 9 100 2 TH E ENGIN E COUL D NO T B E LEANE D WITHOU T QUITTING . BUTTERFL Y VALV E SCREW S VER Y LOOS E WORKIN GOUT . INST WIT H LOCKTITE . 13152 6 CRUIS E 4 " . . 760 3 SHAF T

AFFECTSYST E INADEQUATE Q POWERLEVE R TOP O FBOD Y FROZ E UNSCHE D 198207070004 2 CESSN A 172 N 1727331 1 N46S6 G LY C 6320H2A D L12347 6 .

' . • , 0 • MARVELSCHE B MA4SP A CK3602 8 1 6 . TH E CARBURETO RTHROTTL E SHAFTPROZ E 1 5 HRf i /IFTE REN G OM . A/ C MAD E EME RLANDIN GA T 190 0 RPM . )0»I3 5 CARBURETO RBTW N I^ISP/MAIN T • INADEQUATE Q NON E 4 • 732 2 FUELCONTROUCARBURETO R IMPROPE RMATIN GCESSN A 1721 4 198209170.008 8 LYC0320H2A D 1.7272704 N62M D RL76ai76 T



### . . . ' " < i MARVELSCHE B MA4SP A Ckl09 2 0 EXCES S GA P BETWEE N 2 HALVE S O FCARBURBTOR£USPEC T IMPROPE RTORQXJ E O P BOLT S O RDEFLEC T I N THRBADS.QF . BOLT S O RMATIN GHALVES . 6026 0 BUSHIN G INSPMAIN T OTHE RNON E .4 ' 732 2 FUELCONTROUCARBURETO R CAR B THROTTL E SHAF T WOR N EXCESSIVELY . WOR N CESSN A 172 N 1727220 7 N8466 E 198210130004 8 LYC0320H2AD . RL665076 T 70 1 MARVELSCHE B MA4SP A C44906 4 70 1



## ~ A n airsafety.co m Produc t

Prepore d Fro m Officio/FA ARecord s By : 

## A i rDat a Researc h 986 5 Towe rView , Helotes . lexc o 78023 . 210-695-220 4 -fox210-695-230 1 into«ciinblety.cci m -www.airsofety.co m Printe d Apri l 02.0 4 Page2 0 Copyrigh d 999.200 4 Af rDat a Receardi , 

### A l Right s ReMTwe d 

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# 1 Port

NO . Slog * Op m Severil y AT A Cod e Remorlc j 46A3 3 INSP/MAIN T 4 732 2 Par i Nom e

Ndur * dcon d1 Ndui«dCond 2 AT A Tex t VENTUR I AFFECTSYST E Portlocdio n PoilCondWa i PrecProc T ItplCMHo . Pre c Pro c 2 Operdo r - CARB THROA T MISSIN G NON E198405260002 3 FUELCONTROUCARBURETO R CARB VENTUR I ENTERE D ENGINE . . INSP/MAIN T 732 2 BUSHIN G

PARTIALRPM / TOROTTLE WOR N NON EI98406160QOS E FUELCONTROUCARBURETO R RP M DROPPE D BELO W1500 . POUND . BUSHING S WORN THROTTL ESHAFT . INSP/MAIN T 4 732 2 BUSHIN G

PARTIALRPM / THROTTL B WORN NON E 198406180060 1 FUELCONTROUCARBURETO R Ad l Mir/Md l EngMir/M d PropMh/M d CnvfJMfr/M d CESSN A 172 N LYCOS20H2AD . FACE T MA4SPA CESSN A 172 N LYC6320H2A D FACE T MA4SPA CESSN A n2 N LYCO320H2A D FACETMA4Sr A POO RACE LO N EN GRU N U P FOUN D BUSHIlilG S WOR N CARB THROTTL ESHAFT . 10433 1 INSP/MAIN T 732 2 CARB BOW L

OTOE R SCREW S LOOS E NON E 198408220001 3 FUELCONTROUCARBURETO R FOUN D CARB BOWLSCREW S LOOS E LOC K WASHE RWER EINSTALLED . 18152 1 INSP/MAIN T 4 . 732 2 SHAF T

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SCRE WCARBURETO RLOOS ECESSN A 172 N 1726830 6 N733H K INSP/MAIN T FLUIDLOS S NON E198802220001 5 LYCO320H2A D RL4067 6 02/n3« 8 4 928 - . . • •732 2 FUELCONTROUCARBURETO RMA4SP A 928 . ' ; T H E CARBURETO RBECOME S LOOS E ATTOESPU T O FTOETW O HALVES . THER EI S USUALL T A N INDICATIO N O FFUE L LEAKAGE . THISI S A BEOCCURRINGPROBLBV I O N 160.152 . 172ANDlteS . TH EENGIN ECUT S OU T A S I FA PLU GHA S FOULED . ORTHEMAGSAR E FAULTY . TOSOLyETHE.PROBLEM.REMOVETHBCARBURETOR..tHEN.T10HTBNB6LTSFBOMTH E• THROtTL E BOD Y T O TH EFUE LBOW LASSEMBLY . REPUC ELOC K TAB S AN D REPLAC EFUE LBOW LGASKE T I FNBCESSARv J PROBABL E CAUS EI S U)C K TAB S ARE WSUFFICIEN T ENOUG H TO HOL D FUE LBOW LBOLTS ; " . . . FLOA T CARBURETO RLEAKIN GCESSN A 172 N 1727307 6 N4714 F APPROAC H FLUIDLOS S ENGIN E19880&lb006a > LYCO320H2A D 04/09« 8 4 . • . . 0 732 2 FUELCONTROUCARBURETO B . FACE T MA4SP A CK71450 5 80 0 AFTE RA FUGH T FRO M ORANGJE^VA . TO PHD , OHIO , UPO N REDUaF WPOWER . I N TH EPATTER N A T PHD . TH EENGIN E COMPLETEL Y SHU T DOWN . AFTE RA SAF ELANDING . FUE LWA S RUNNIN GOU T O FTH EBOTTO M O FCOWLING . DISASSEMBL Y O FCARBURETO RREVEALE D BRAS S FLOA T WA S APPROXIMATEL Y HAL FFUL LO FFUE LT T SINC E CARBURETO RWA S OVERHAULE D 80 0 PLUS . ] .

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OTOE RNON E I994033KM03 I LYC032QH2A b L25B47i8 ' 03/110 4 . OPO R' ;:•. . -'.0 ; • • 732 2 FUELCONTROUCARBURETO R. ' 0 INSPECTIO N FOUN D VENTUR I FAILUR E CTW O HECE ) A D 93-18-0 8 NEED S TO B E COMPLIE D WIT H SOOtlERTHA N TH E 4 8 MONTHS . ENGIN E RA N ROUG H AN D DROPPE D 10 0 RPM . • . - •••..• . " . . ; 66«9I « FLOA T CARBURETO RLEAKIN GCESSNA172 N 1736779 8 N7!t86 8 APPROAC H ENGIN E STOP P OTHER " 199406160007 4 LYCO320H2A O .Lt:Ifi676 , 04/110 4 4 • ' . ..<20 . 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A CKOIOBS O 0 \ ENGIN E FAILUR E OCCURRE D I N AIRPOR T TRAFFI C PATTER N WHE N THROTTL E WA S REDUCED . SUCCESSFULLAFn)iN G MAD E O N AIRPORT . PROBLE M COUL D NO T B E DUPUCATE D O N GROUN D RUN.UP . CARBURETO RWA S REMOVE D AN D SEN T FO RREPAIR . META LFLOA T FOUN D T O CONTAI N FUE LFLOA T REPLACED . . 106136 . CARBURETO RJE T ENGIN E BLOCKE D CESSN A 172 N 1727378 6 N6416 J INSPMAIN T OTHE RNON E 199608040076 7 LYCO320H2A P .06/190 6 4 ' •.••.••; • 0 •". - 73J 2 FUELCONTROUCAHBimETO RFACETMA4SP A CT6ld93 1 124 8 TEA RDOWN O FCARBURETO RTO IDENTIF Y REASO N FO RFAILURE . MA I NJE T ASSEMBL Y WA S FOUN D PARTIALL Y BLOCKED , BLOCKAGE REMOVE D USIN GA .04 0 INC H PIEC E O FSAFET Y WIR E PASSE D THROUG H TH E OUTLET . EN D O FTH E MAI N JE T ASSEMBLY . , CK1398 3 CARBURETTO RENG.FUE LFAULT Y CESSN A 172 N DESCEN T VIBRATION/BUFFE T NON E 199611010099 9 LYC0320E2 D . L4388427 A 04/010 6 4 . • - - .'..•••'; • 0 .- . • 782 2 FUELCONTROUCARBURETO RFACETMA4SP A CK1398 3 - d (AUS ) CARBURETTO RFAULT Y - SUSPEC T TEMPORAR Y CONTAMINATTO N O RINTERMnTEN T FAILUR E COMBINE D WIT H • NO N FIRIN GO FN0 4 CYLINDERCAUSE D ROUG H RUNNIN GENGIN E - CARBURETTO RICIN GWA S DISMISSE D A S TH E CAUS E 22916 4 DISCHARGETUB E CAR B PUM P DETACHE D CESSNAI72 N .17271717 ' NOliS E NO T PARTIA LRPMrt>W RUNS(3IE D 199702270i60'! 6 LYCO320H2A D L50437 6 lOro40 6

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## Printe d Aprii02,o 4 " ! Afialrsafety.to m Produc t Pag e 2 7 Prepare d Fto m Officia l FAARecord s By : 

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. 0 - SCREW S BOWLBOD Y LOOS E CESSN A 172 P1727507 8 N5492 0 TAXI/GRN D OTOE ROTHE R198512310009 S LYCO320D2 J . L1136239 A 11/18JB 5 4 • • ' • ' • • • • . 197 6 . 731 2 FUELCONTROUCARBURETO RFACE T MA4SP A CH81.719 1 .197 6 EN GWONTSHUTDOW N WHE N MIXTUR E WA S PULLE D T O itJL E CU T OFF"-INVES T REVEALE D AL LFOU RSCREW S HCUMN G BOD X BOyiO . WER ELOO S E . LOCKIN GTAB S WER EPROPERL Y BENT.TICHTtNIN GSCREW S CORRECTE D PROBLEM. . PROBABL E CAUS E WA S jSEALO RGASKE T COMPRESSI N GWiTOAGERECQMMENDINSPECTIONEAC H lOOHMNSPECTTON. .

ACCE LPUM PC/VR B N O OUTPU T CESSN A 172P - , 1727625 3 N91E R, INSPMAIN T OTHE RNON E19(|70701000 B LYCO320D2 J L1352639 A 01/270 7 4 • • • ' ' '•'•. . 9 8 • '732 2 FUELCONTROUCARBURETO RFACET.MA4SP A 0X91921 1 » « AFTE R98. 2 HOUR S O FOPERATIO N I T WA S POUN D THA T TH EACCELERATO RPUM PWOUL D NO T DISCHARG EFUEL . O N JANUAR Y 19.198 7 TOE CARBURETO RWA S SEN T BAC K T O CESSN A FO RWARRANTY . TOENE WWARRANT Y CARBURETO R WA S THE N RECEIVE D O N JANUAR Y 26.198 7 SWCK4-19233 . UPO N OPERATIONA LINSPECTIO N I T WA S FOUN D THA T TH E NE WWAIUtAIffYCARBURETXl RALS O HA D A N ACCELERATO RPUM PTTIAT WOUL D NO T DISCJMRG EFUE L• ' • \ ACCE LPUM P CAR B N O OUTPU T CESSN A 172 P- r72762& 3 N91E R INSP/MAIN T OTOE RNON E198707010001 8 LYC632eD2 J L13526M A 01/2607 . : 4 ' : e'' . : 732 2 FUELCONTROUCARBURETO R.FACETMA4SP A CK91928 3 0 . AFTE R98. 2 HOUR S O FOPERATIO N I T W/V S FOUN D THA T TH EACCELERATO RPUM PWOUL D NO T DISCHARO E FUEL . O N JANUAR Y 19.198 7 TOECARBURETO RWA S SEN T BAC K T O CESSN A FO RWARRANTY . TOENE WWARRANT Y CARBURETO R WA S TOEN RECEIVE D O N JANUAR Y 26.188 7 Sft I CK4-19233 . UPO N WHIATIOHA LINSPECTIO N I T WA S FOUN D THA T TH E NE WWARRANT Y CARBURETO RALS O HA D A N ACCELERATO RPUM PTHA T WOUL D NO T DISCHARG EFUE L

THROTTL EPLAT E VIBRATTON/B U CAR B SCRE WMISSIN GCESSN A 172 P1727621 0 N9766 4 TAKEOF FVIBRATTON/B U UNSCHE D 198707220003 7 LYCO320D2 J L1331939 A 06/190 7 4 ' • • . ' • 0 732 2 FUELCONTROUCARBURETO RFACErTMA4SP A CK81853 7 0 EN GROUG H O N TAKEOF FPILO T WEN T T O PUL LPOWE ROF FBU T WA S UNABL EDU ET O TOROTTLEPLAT EJAM B DU ETO :SCRE WMISSING . UPO N INSPECmO N FOUN D SCRE WI N N R4 CYLINTAK ETUBE . 

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OTOE R VENTUR I NON E MISSIN G

199310050006 1 CESSN A 172 P

LYCO320D2 J '.•-'' • 

### 1727665 9 ^ N9447 L L1413339 A O9/2I0i 3 4 •..••:••• • -181 7 732 2 FUELCONTROUCiUlBURETO RFAdETMA4SP A ! . 0 O N INSPECTIO N WTT H CARBURETO RREMOVED , FOUN D SPU T VENTURI . O N RBMOVALO FCARBURETO RBovii ^ INNE R VENTim i WA S Ul^ T AN D ONL Y 2 O F3 CUP S COUU ) B EFOUND . GASKE T SHOW S IMPRIN T O FTOIRD C^P . END S O F VENTin U SUPPORT S SHO WWEAR . WIL LINSPEC T COMPLET EINTAK EAN D CYUNDE RBORE S FO RTOIRD CLI PO RDAMAG E FROMCUP. ' ~ . • 3078 6 FLOA T ASSEMBL Y INSPMAIN T FWIPIOS S 4 VIBRATIONffi U 732 2 FUELCONTROUCARBURETO R CARBURETO RLEAKIN G NON E199311090006 0 CESSN A 172P ; LYCpsaDp2 J PREAlRMA4Sr A 17276974: - N6616 8 L981489 A 19/138 3 7500980 4 4!i 3 AFTE RERRATI C ENGIN E0F;ERATT0N S A T AN D NEA RIDLE . TH ECARBURETO RCOMPLETEL Y FUXIDE D DURIN GA N ATTEMPTE D ENGIN ESTART . FOUN D CARBURETO RFLOAT/ASSEMBL Y HA D LEADE D FUE LINSID EO PFLOAT . AD92-I8-1 6 APPUE S ONL Y TO CONSOUDA1E D FUE LSYSTE M FLOAT S WIT O DAT ECOD E10.91 : THI S FLOA T APPEAR S T O B EA PRECKlO N AIRMOTTVEDATE D 7-90 . A N OVERHAULE D CARBURETO RWA S INSTALLE D AN D RETURNE D T O SERVICE .

HEA T BOX OTHE R CARBURETO RBUTTERFL Y LOOS ECESSN A 172 P NON E. 199312090002 9 1727688 6 N6678 6 INSP/MAIN T OTHE RNON E. 199312090002 9 11/110 3

. 8 292 9 " 716 0 AI RINTAK ErACETMA4SP A 0 . BUTTERFL Y VALV EFO RCARBURETO RHEA T WA S EXTREMEL Y LOOS EO N SHAF T (ABOU T T O FAL LOFF) . TOETW O RIVETS . THA T HOL D TOEBUTTERFL Y VALV ET O TH ESHAF T WER EWOR N THROUG H ABOU T TWO-THIRD S O FTH EDIAMETER . CARBURETO RTUB E OTOE R ACCE LPUM PLO<>S E.CESSl<A172 P17276018 - N5463 & NO T OTOE RUNSCHE D 199509160043 6 LYC()S20D2 J RLI4966S 9 08/100 5 4 •

• 0 732 2 FUELCONTROUCARBURETO RFACBrMA4SP A CK4985 3 171 5 RP M COUL D IK) T B EREDUCE D BELO W2,00 0 RP M IN-FTJGHT , NECESSITATTN GPOWER-OF FLANDING. . Ih^PECTKl N . REVEALE D TOECARBURETO RACCELERATO RPUM PDISCHARG ETUB EHA D COM ELOOS EAN D LODCE D I N TH ETHROTTIJ E VALV EPREVENTTN O FUL LCLOSUR EOFTHROTTLE . TOEOVERHAU LMANUALSPECIFTE S TH ETUB EI S HEU > I N PIAC E WIT O LOCTTT

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### 23361 6 VALV ECARBURETO RCRACKE D INSPMAIN T OTOE RNON E19980926002( R 4 MOG R 732 2 FUELCONTROUCARBURETO R CESSN A 172 P LYCO320D2 J FACE T MA4SF: A 

### I727B91 7 N604M A LI266639 A O6ni30 8

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• • • •'.•.•.-. . 

### MA4SP A CARBURETO RENGIN EMALFUNCnONE D CESSN A 172 Pl7r»67 8 N660S 8 NO T OTOE ROTHE R199906260003 1 LYCb326D2 J LI50li39 A 06030 9 4 ••'••; ' 289 ' • . 732 2 FUELCONTROUCARBURETO RD C 322« 6 0 ENGIN EWOUL D NO T SHU T OF FWIT H MDCTUR ECONTRO LFOUN D (ViRBURETO RBO>V LLOOSE , BliyMOUWTiN C BQLT 8 STTI X HA D L()C K

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## , PortCondHio n

RplCMNo . Operdo r Acl l /MIr/M d

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### togSN PropS N Cmp I S N AcHRegNo .

DRHcdIyDqt e ' Totdlbn e Tkn cSinc e O/ H VBAll O - WASHE RBOD Y TO LOOSEN S CESSN A 17 7 1770071 0 N3410 T JJO T OTOE RNON E1987011400O0 6 LYCO320E2 D 11/170 6 4 • • . 0 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A 8 0 /U X FOU RSCREW S O N THROTTL EBOD Y TO BOW LWER ELOOSE . SUBMITTE RREUEVE S LOC K TA B WASHER . SUPPUE D BY . MARVE LSCHEBLER . T O B E INSUFFICIEN T A S J T ALLOW S SCRE WTO TUR N .2 5 TUR N BAC K AFTE RTTGHTENIN G/VN D LOCKING . REPLACE D SCREW S WIT O DRILLE D TYP E AN D SAFET Y WIRES . • " 812221 9 CONTRO LCABL ETHROTTL ECRACKE D CESSN A 17 7 1770034 2 m942 X iNSP/MAlN T OTHE RNONE . 199607280031 8 <y7/13S 5 4 141 3 760 3 POWERLEVE RFACE T MA4SP A A121231 0 0 DURIN dA SCHEDULE D INSPECTION . FOUN D TOROTTLECABL E BEN T AN D CRACKE D A T TH E BEN D LOCATE D A T TOE TOREADED EN D WHERSTH ERO D END'ATTACHB S TO TOEC:ABL & I T APPEARE D WHE N TH ETOROTTLEHI T IT S STOP . TH E TORQTILE CABL E CONTINUE D TO B EPUSHED - TH ECABL EHADT O B EREPLACE D WHIC H I S VER Y COSTLY . 323 2 SHAFTFLOA T CARBBOW LMFGWFtON GCESSNA177 B 1770179 0 N341 1 INSP/MAIN T INADEQUAT E Q NON E198110010006 2 LY C OS20D3 G916989 A 4 • ' '• 732 2 FUELCONTROUCARBURETO RMARVELSCHE B MA4SP A 1364 1 0 A T CAK B OVERHAU LSHAFT-FLOA T LEVE RI N REPAI RKI T 286-169 0 WA S FOUN D CRIMPE D O N SAM ESID B A S COTTB RPI N HpLE . • . ' .

ENGIN E STOP P UNSCHE D CUM B 4 732 2 FUELCONTROUCARBURETO R EN GQUI T AFTE RT/0 . CAR B REPALCED . EN GRA N OK . INO P 198607260004 7 VARG A 2150AMORIS Y LY C O320A2 C SNSNC H 74D M FACE T MA4SP A VAC1607 9 N8364 J LR9I2727 A A486t 6 108 2 CK71364 9 108 2 INLE T CA P FLUI D LOS S CABURETO R NIJN E CRACKE D

199309280004 0 VARGA 21&0AMORIS Y

LYCO320A2 C VAC1197 8 N8273 J INSP/MAIN T FLUIDLOS S NC)N E199309280004 0 . LYCO320A2 C 08/010 3 4 - ' • • 76 5 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A CK51044 7 . 0 DURIN GANNUA LINSPECTION . FOUN D HEAV Y STAININ GAN D WETNES S O N CAP . REMOVE D CA PAN D CLEANE D WTT H LACQUE RTHINNER . FOUN D 2 SMAL LCRACK S O N CA PFLANG ETHA T EXTENDE D BEYON D RADIU S AN D INT O BOW LPAR T O FCAP , APPROXIMAT E LENGT H O FCRACK S .125 0 INCH . REPLACE D CAP . GASKE T AN D LOC K TA B WASHER S FO RTH ETW O ATTACHE D SCREWS . SUBMITTE RSTATE D POSSIBL ECAUS EWA S OVERTORQUEIN GSCREW S PREVIOUSL Y T O STp PFUE L isEEPAGE . , • • - . . - . , • . • VALV E FLOA T BOW LSTUC K OPE N BLANC A 7GCA A 3617 8 N2666 Z NO T WARNIN GIND I NON E198201140007 3 LYC0320/U D L4775227 A V ' . • . " 0 732 2 FUELCONTROUCARBURETO RMARVELSCHEBMA4SP A A402060 3 '. . 0 TH E FLOA T VALV EI N CAR B STUC K OPE N CAUSIN GEXTREMEL Y RIC H MIXTUR EAN D isSEVER ELOS S OFPOWER . INSPMAIN T FLinDLOS S 4 : • 

## - . NON E 732 2 FUELCONTROUCARBURETO R LEAKIN G 198611250018 4 BBAVI A 7GCA A

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### 4 NON E 732 2 FUELCONTROUCARBURErTO R SIMILA RTO PROBLE M DESCRIBE D ALERTS . HEAV Y 198405670004 2 BBAVI A 7GCB C LYCO320A2 D SNSNO I 74D M FACE T MA4SP A .3417 7

79S W L3969227 A A381798 4 N4213 Y



### 24 9 24 9 N8S51 V 

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### 4 732 2 CARBURETO RENGIN E

FLUI D LOS S NON E PARTIA LRPMn»W R FUE LCONTROL«ARBURETO R FLOOD S 199802260046 8 AMTRLONGE Z

LY C 0320 *

SCREW S BOD Y HALVE S LOOS E.PIPE RPAI S I860Z 4 N7869 D CRUIS E VIBRATIONffi U NON E198204200007 9 LY C 0320 / Lt698227 A 4 AFFECTSYST E. 0 . 732 2 FUELCONTROL/CARBURETO RMARVELSCHE B MA4SP A . 0 EN GHOUGH DU ETO LOOS E SCREW S HOLDIN GC^AR B BOD Y HALVE S TOGETOER. SAFET Y WIR ESTIL LINSTALLED .

( • ) .2919 3 VALV EFLOA T CU P

CUM B AFFECTSYST E UNSCHE D 4 ENGIN ESTOP P 732 2 FUELCONTROUCARBURETO R SEPARATE D PIPE RPA1 8 18602 4 N7869 D 198204200008 0 LY C 0320 / L169S227 A •.; . Q MARVELSCH ^ MA4SP A 401594 ^ » EN GQUI T DURIN GCUMB . FOUN D FLOA T VALV ESEPARATE D FRO M CUP .

SCREW S BODYT O LOOS E PIPE RPAI S 18891 7 N705 6 INSP/MAIN T FLUIDLOS S NON E198504180000 6 LYC0320B2 B L2e76627 A •' 4 '"O' . 732 2 FUELCONTROUCARBURETO RFACE T MA4Si» A 179 6 32 7 FUE LLEA K

A T CARBURETOR . FOUN D BOW LMOUNTIN GSCREW S LOOSE . LOC K TABS NO T SECURIN GSCREWS . 8R 0 OCCURRENC EI N fLEET 1036783 2 

### NO T 4 732 2 : CARBURETO RENGIN E

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### 24 2 A S TH EOUTSID ETEMPERATUR E GO T CXILDE RO N TH EUFt>Ef

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OTOE RNON E FUE L(XINTROUCARBURETO R BROKE N 1981122300030 . PIPERPA18I5 0

LYCO320A2 B MARVELSCHE B 18768 3 L119602 7 399094 9 N3839 Z

0 0 TH E FLOA T ANDLEVE RASSEMBL Y P N A30-62 8 SEPARATE D A T LEVER . PART S FEL LINT O BOTTO M O FBOW L 

## A n airsafety.co m Produc t ^ Prepo f e d Fro m Cjfficto/ FA ARecord s By : 

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. CUM B OTHE RNON E198408140014 1 LYCO320B2 B L2333927 A 4 . 2 0 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A 402622 2 2 0 CAR B KI T NO . 66691 6 INSTALLE D EN GLOS T 160«0 0 RP M DURIN GCUMB . LEVE LFUGH T EN GNORMA LFLOA T TRAVE L INSUFFICIENT . . .• ' . - ^ 66691 6 FLOAT . DEFECTIV E PIPE RPA1815 0 18891 7 N705 6 UNKNOW N FLUIDLOS S NON E198408140014 2 LYCO320B2 B L2070627 A

' 4 ' . • 1 5 . . • 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A 399623 . 1 5 CAR B FLOA T Ki t

66691 6 INSTALLED . EN GRUN S ROUG H A T LO WKP M AN D FUE LWA S LEAKIN GFRO M CAR B AI RBQX . FLOA T TRAVE LINSOF FICIENT . .^ ^ • • ' .

BUTTERFL Y HOUSIN GBINDIN G. PIPE RPA1816 0 18780907 8 N8332 6 INSP/MAIN T OTOE ROTHE R198610140006 8 LYCO320A2 B RL182772 7 10/060 6 4 PARTIALRPM / 0 7322 . . FUEL(X)NTROUCARBURETO RFACETMA4SPA - 1036783 2 1 0 TH E ENGIN EWA S REDUCE D TO JDL EFO RLANDIN GAN D THROTTL E COUL D NO T B E REAPPLIE D FO RADDITIONA LPOWER . EMEFiGENC Y LANDIN GWA S MADE . TH E CARBURETO RWA S REMOVE D AN D SEN T TO LY(X>MIN GFO RWARRAhlT Y REPLACEMENT . SUBMITTE RSUSPE(?T S STICKIN GO FTOE THROTTL EDU ETO BINDIN GO FTH EBUTTERFL Y /VND SHAF T AGAINS T TOE HOUSING . TOIS PROBLE M HA S BEE N FOUN D O N TW O OTHE RAIRCRAF T WIT H LO WTIM EO FTH E CARBURETOR . ] ^

BUTTERFL Y HOUSIN GBINDIN GP1PERPA1815 0 18810908 4 N912e 3 INSPMAIN T OTHE ROTHE R198610140007 E LY C O320A2 B RL182^2 7 10^)60 6 4 PARTIALRPM / 0 732 2 FUELCONTROUC/VRBURETO RFACE T MA4SP A 401335 2 5 TINABL E T O REAPPL Y POWE RDURIN GAPPROACH . TH ECARBURETO RWA S RECONDITIONE D B Y LYCOMIN GI N JULY . I T HA D T O B ERETURNED FO RWARRANT Y REPLACEMENT . REPAI RSTATIO N N R1108 . '

BUTTERFL Y HOUSIN GBINDIN GPIPERPA1815 0 N9118 7 APPROAC H OTHE RUNSCHE D 1986lbl6000a 6 LYC0320A2 B RU96412 7 09/120 6 4 PARTIA LRPM / . 0 732 2 FlJE LCONTROUCARBURETO RFACE T MA4SP A A3817618 . 3 i AlRCaiAF T CRASHE D DU E T O THR()TTL E BEIN GSTUC K A T LOWE RPOWE RSETTING . MALFUNCTTO N PIPERPA1815 0 ]881090i8 4 N91203 . NO T OTHE RNON E198611050008 0 LYCO320/V2 B RL182752 7 09/260 6 4 • . • • . • ' 6 • 732 2 FUELCONTROUCARBURETO RFACETMA4SP A 401335 2 6 DE C 1986 . UNABL ET O REAPPL Y POWE RAFTE RREDUCTIO N O FPOWER . EMERGENC Y LANDIN GWA S MADE . TOE CARBURETO RWA S REPLACE D A N D SEN T TO LYCOMIN GFO RWARRANT Y REPLACEME^ . CARBURETO RWA S LYCOMIN G RECQNDtTTONE D B Y FA A APPROVE D REPAI RSTATIO N N R1 1 08 . JUL Y 1985 . .

. CTLLOCKE D P1PERPA1815 0 18760907 8 N8332 6 NO T OTOE RNON E198611060008 1 LYCO320A2 B . RL182772 7 <n/260 6 4 - . •

• • • • • ' - ' :io' ' • • 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A 10367882 . 1 0 MAYS . 1986 , ENGIN E REDUCE D TO IDL E Ft)RLANDi mAN D COUL D NO T REAPPL Y THROTTL EFO RADDTTIONA LPOWER . EMERGENC Y LAIffiMNGWA S MADE . CO\RBURETX>RWA S lU^PLACE D AN D SEN T TO LYCOMIN GFO RWARRANT Y REPLACEMENT. : CRUIS E 

### 4 732 2 CARBURETO RMATIN G

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# X. j Printe d Apriio2.0 4 ~ ' • " ^ Anairsafety.co m Produc t Pag e 43 ' Prepare d Fro m Officio l FA ARecord s By : 

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M ENGINE COWUNG AREA . Printe d ApritD2,0 4 Page4 6 210-695-220 4 

## A n airsafety.co m Produc t Prepare d Fro m Offico t FAARecortl s By : 

## A i rDat a Researc h 986 5 Towe rView , Heloles . Texas 7802 3 • Fox210-695-230 1 friio9ofrsolety.eom - wWw.ofrsotety.co m Copyrig M 1999,^00 4 Af rOdaReseoid i

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. I N TH E INDUCTIO N SYSTE M AN D SPREA D TOROUGH TH E ENGIN E COMPARTMENT : T H EFIR E WA S EXTINGUISHED , SUBSEQUEN T INVESTIGATIO N FOUN D CARBURETO RFLOA T STUCK . DUMPIN GRA WFUE LINT O TH E INDUCTIO N AI RBOX . 

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732 2 FUELCONTROUCARBURETO RFACETMA«iSP A ;CK81527» ' 0 CARBURETO RMIXTUR E CONTTMM . DI D NO T FUNCTIO N PROPERLY . UPO N INSPECTION , P N 86-1 8 LOCKWIRE , FOUN D FATIGUED , CRACKE D I N HALF , NO T ALLOWIN GFO RMIXTUR E CONTRO LSHAF T T O B E PROPERL Y OPERATED . MA4SP A CARBURETO RTUB E ACCE LPUM P LOOS E PIPE RPAiai6 1 2879603 9 N2I42 8 NOT . W/UININ GOTHE R199701090082 9 LY C 032(«>3 C LS61839 A iim/ M . 4 NB2 B 188 6 732 2 FUELCONTROUCARBURETO RFACE T CK6li4l 7 . 0 I N FLIGHT , RP M WOUL D NOTbBCREASEBELOW200 0 RPM . INVESTIGATIO N FOUNDACCELERATO RPIM P NOZZL E DISLODGE D AN D LYIN GI N AI RBOX . CARBURETO RSEN T T O REPAI RST A FO ROVERHAU LSUSPEC T FK>ZZLE/U>i)BSIV E. BROKE N LOOS3E WHE N SINGL E PIEC E VENTin U WA S INSTALLE D A T 186 5 HRS-LANDIhX ; WA S SAFE . N O DAMAG E ENGIN E KILLE D O N FINAL , WIT O MlXUTR E CONTRO L: . . ^ : MA4SP A CARBURETO R. THROTTL E SH/lFTFRpZ E PIPERPAiaiO l 28781612 8 N4771 7 INSPMAIN T OTOE RNON E 199705290030 2 LYC03!!«I>8 6 . L3589927 A 04^90 7 4 • • '.'.;• • ' p ^ ••. • • 732 2 FUELCONTROL/CARBURETO RFACE T 0 THROTTL E SILiF T FTtClZ E I N BUSHINGS , POSSIBL E RESUL T O FPREVIOU S INSTAlXAnO N O FTOROTTLE SILtf T raT. UNABL E T O DETERMIN E EXACXCAUSE . - . .-•... ; . ' ' • ' MA4SP A CARBURETO RTHROTTL E LOOS E PIPERPAJSlS l INSP/MAIFT T OTHER ' NON E 1997O6I9OO20 8 LYeO320D3 G05/22« 7 • A ' ' 0 . 732 2 FUELCONTROUCARBURETO R90 0 THROTTL E BOD Y WIOSE : A T PARTIN GSURFA{: ETX 3 FUE LBOW LDU E T O LObsENlNGO FLOCMN GTAB S VNp T TH E RETAININ GJOLTS' . SUBMITTE RRECOMMEND S SAFET Y wiot E I N PLAC E O FTABS . THlRDlNt^lDEN T NOTE D WIT H LOCKIN G 

## \ ) F>rinie d Apritoi2.0 4 ^ ~ A n airsafety.co m Produc t ~" ^ Coi^righ t 1999.200 4 Af rDat a Researc h V _ . Pags4 7 /VeporedFromOfficib/FAARecordsBy : A l Right s Fleserve d 

# Ai rDat a Researc h 986 5 Towe rView . Helotes . Texo s 7802 3 210-695-2204-fo x21.0-695-230 1 «i(o©oirsolety.cd m - virvrt(.«^solety.co m

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- ; _ Difiiculty Rqwi ^ butto n a t th e to p lef

t t o sen dth e fonn . Man y o f yoohav e iiK^jM l a^Qii^'tlj ^ sertfce . I t f Y isnaw-.aYaUab)ev.an4ween<;Qurageeveiyonetouse.this.forniat.whensubn^^g a v infoamMtQiu .



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# : ( I S^yiGEDIjracmTYlUEPOHTIN Q PROGRA M Th e objectiv e o f

th eServic e Difficulty Reportin g (SDR ) Progra mi s to . achiev e promp t an dappropriate : conectio n o f

condition s adversel y afTectihg continue dairworthines s o f aeronauticia

l product s fleet

wide . Th e SD Rprogra mi s an exchang e o f informatio n an dametho do f communicatiohbetwee n the . FA A an d th e aviatio n communit y concernin g inservic e problems . A repoir t i s file dwheneve r

asystem , component , o r

par t o f an aircraft , poweiplaiit , propeUfir , o r applianc e fail s t o functio n i n anorma l o r usua l manner , i n addition , i f asystem , component , o r

pai t o f a n aircraft

^ poweiplant , propeller , o r

applianc e ha s afla

w o r imperfectio n whic himpairs , o r whic hmay impai r

it s friture function , i t

i s considere ddefectiv e an dshoul db e reporte dunde r th e program . Thes e report s ar e know n b y avariet y o f names : Servic e Diflicul ^ Report s (SDR) , Malfunctic man d I^efec t Repoit s ( M an dD ) an dMaintenanc e Difficult y Repon s (MDR) . Th e consolidation , collatio n an danalysi s o f th e data , an dth e rapi ddisseminatio n o f trends , problem s an d alei t informatio n t o th e appropriat e segment s o f th e aviatio n communit y an dFAA effectivel y an d economicall y provide s ametho dt o ensur e future aviatio n safety . Th e FA A analyzes SD Rdat afo r safety implication s an dreview s th e dat at o identif y possibl e trend s that ma y no t b e apparen t

regionall y o r

t o individua l operators . A s aresul t o f dii s review , th e FA A may disseminat e saficf

y informatio n t o aparticular sectio n o f

th e aiaatio n community . Th e FAA als o ma y adop t ne w regulation s o r

issu e airworthines s directive s (AD's ) t o addres s aspecifi c problem . Th e primar y sourc e ofSDR' s ar c certificat e holder s operatin g unde r Part s 121,125,135,14 5 o f th e. Federa l Aviatio n Regulations , an dth e geiieral aviatio n communi s whic hvoluntaril y submi t records. - FA A Aviatio n Safety Inspector s ma y als o repor t servic e difficulty infonnatio hwhe n the y conduc t routin e aiiciaft.an dmaintenanc e surveillanc e a s wel l a s acciden t an dinciden t

investigati(>ns. . Th e SD Rdatabas e contain s records'datin g bac k t o 1974 . Report s ma y b e submitte do n th e Interne t throug ha n activ e dats i entr y formCM-o n han i copy. . Th e electfoni c dat aentry fc>n n i s i n th e AFS-€(X) Aviatio n Infoniiatio n we b sit e unde r th e headini g SD RMai n Menu . TheUIULis : <http-i/av-infoJiuLgov > A publi c search/'query tcxil i s als o availabl e o n thi s sam e we b site . Thi s too l ha s provision s fo r printin g remit s o r downloadin g data . A t th e curren t

time w e ar c receivin g approximatel y 45,(X) 0 record s pe r year .

1 9

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## ' Fedeia l Avtano n AdrnMstroffo n Hegtjfatoi y Suppor t O/tnslo n 

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# ^ ALER T r NUMBE R 27 8 

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## LINl' l K » .ST.V t

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# Memorandxuii RiDERA LAVIATIO

N AGEKCY . T O Chief , laish t Standard.' ? .Fiel dDivisio n Ho . 3 DATE : 

## Jun e 21 , 196 1 Attention : Chief , Propulsio n Section . i'S-31|i O • ; ' . . .KRO. M Chie f

J Propulsio n Sfectio n suDjEcryioa t

Kcodle . Valy c - A.>5s y i»233-58 0 Pro mMarvtj l Scheble r M A i|- $ Cax-b\iretor , ;5/

N f|00I|l|66 ; GAD O l-ll j Memorandu mt o FS-rllO O Date d Jun a13 , 1^61 . •Thi o .subjec t

meterin g vsj.v e an di.-.3mprandu n ar e bein g forwajxie dt o yo u fo r inspectio n and-arsj * othe r actio n yo u dee mappropriate . Af.tsn^ard apleas e retur n th e par t t o thi s office . Thi s cai-biireto r

co'iBpooen t

>;a s reniove dfro m3 Pipe r PA-2liairplar. s }.i:ir. hcMJcricncc da n cntiin c fir e darin g norma l descen t fo r . a lancin g a-oprosch . Indication s ar e -tha t a.fuel-fe dfir e occurre d a t th e ccrbureto r

ai r bo x an diiile t

scree n an dsprea dt o th e rea r righ t portio n o f

"th e nacell awliere.nioa t o f th e fir e damag e appeared . Th « r^aeons ; fo r

suspecting'th e float * valv e stickin g i n th e open , positio n .ai- e tli o extrtin?.l y jaeec dguid e edges , o n th e valve^landnih e fee t tha t 3 sof t rcct.illic sriir/in£\-(.l/6 " - nor!-raagnetic)va 5 foun d betveei i t-hc y.-l.v e rji dvnly c seat . Th e .cdrplcni i ha dapproadlnist f 60 0 hour.- , o f

flyin g -tiis c \-TJX tlxj carbureto r >»as neve r

disssscm]il(i4 j a s f.-vr a s ,'K 2 rknovi V Tri ? pilot'iridicatcd.tb& t fo r aomo-tim s tl«/..i.r 7 ijncjin e rnn . i'ouj; h.a t yti'ious-po;*er,.ietting s an dwa arathe^ r sentpt^ f t o inixtur o co;itrol . 3}-srianipulatin g th e throttl e an dwirture7/^ , .control , ."th e pilot , wa s .abl a!t 6 .achiev e smoothe r engine " operataon T

. Thc.nopv c dcjcidc-e dcoriditio n reflect s cithe r . n qualit y contip3{):i^?' ^ dcficiciicy j o r

abogu s p;u- x on-.th-i o caroui'etb r model . •.Ue . would' ' :/ X r.;:^recint c yovvr

cominjait c ;.nd/oi ' thos e o f th e CErburcto r

)nanu 4 J.,-^- ) facLurc- r

rctarcin y th e obceryaT.ion s liste di n th e attache d'* ' " " ' men;craridiuii « •

S . H . Ross , FS-ial| 0 Attcicbusnt a 

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## . 01cA t uR. " 1111NO.Is. ' u . s . A. - ; . ' ^ " . "; ' AIRCRAFT . December.:20 , W6 3 

# SERVIC E BULLETI ^

•'• #A6-6 3

TO : Al l Outlet s . .iUBJBCI : New Floa t Valv e wit hMechanica l Attachment ; to'Floa t . ; . CARBURETERS AFFECTED : Al l MAH- S ani J 6-Serie s ^A n Inprovc dfloa t

valv e liicchanisn i .whic hattache s th e valv e t o • th e .float , i s goin g into.' , productio n o n alls'ubjec t carbureters. -

. - ^ -Positive , attachmen t o f the-fl'oat.-valve , t o the-floa t wil l assure/'— ; ' . ! th e va.lv e bein g pulle dof r th e sea t

whe n th e floa t

drop s .t o admit, ' I' Y \'. - . . :..•'../.•••additionxl-fuel^ ; .''....-. : '•.'„•• • •.:.':" • • • •;•''•:''-•." . .'':' • •'."•' . V-'..;'- . ' " •':.,••_.'• • Some"[sticlciri g ha s bee n .re.ported,'.du e t o deposits-fro mevaporate d'" '

. . fue. l .an dother'foreig n materials. - . - .. / . ^ ," " ,;'.. . '• . .TIJ C attachnen t

cli p i s easil y insta.ile dan dhel di n plac e b y the . .-.floa t shaft,-,a s ^how n i n the - illustration s on,th e revers e sid e

. . ' ? • o f

thi s bulletin . . • ; • : ' \ - The ' ne w par t

numbe r

i s A233-61-4-floa t valve , sea t

an dcli p assembly. - whic h,Vf

i 1 1 replac e par t

numbe r

A233-606 .

.. ' : " • . . ' • • A233-61^..Lis. t Pric"e ^ • ,S7.6 0

" ; • . Avaiiabi e fro myou r Marvel-Scheble r

.Distributor . MARVEL-SCHEBLE

RPRODUCT S DIVISIO N . . A -



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# r r r r r r Federa l Aviatio n Administratio n - Servic e Difficult yRepor t Databas e

PoitNO L Por

t Nom e Sktg e Op m Nolur * o f Con d 1 Severit yNohir e H Con d 2 Al ACod e AT

ATex l Remoftc s rat i locolo n ro d CondlHo n rrecPiDc l MCMNo . fre e Pio c2 Opcfolo r. Acl l Mir/Md l EngMlr/Md t Pro p Mfr/Md l Cmp t Mk/Md t AcllSN . Acll.FI*flNo . . . EngS N DMcvUyOol * Prop» ^ Toldinine . CinptS N lhn*Snc«o/H . ATlilGHRP M LEANMIXTUR B NON E 197e0321000( 3 CONTO300 D 2902 7 TAXI/GRN D OTHE R WWARNIN GIND I 732 2 FUELCONTROIVCAHBURETO RMARVELSCHE B MASSP A S57781 R L^A N MIXTUR EA T HIG H RPMREMOVE D & REPLACE D CARB.O- H REP LP N A86540yALVE.P N A166K aKIT.A4M 9 PACKINa^78889&A7812 1 • .

ACCE LPUM P OTHE R NON E FAILE D 19790731000« 0 UNKNOW N 4 732 2 FUELCONTROlyCARBURETO R. FACE T MA3SPA . WATE RCOhTTAMINATlb N CAUSE D FAILUR EO FACCELERATO RPUM P« COR RO FCY LWALL S

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## " '~ ' /i n airsafety.co m Produc t Prepare d Fro m Officio l FA ARecord s $r 

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## ( ) A194&9 3 PLUNGE RACCLPUM PRUSTE D INO PCESSN A 15 0

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Printe d Page s Apri l 02,0 4 210695-220 4 

## A n airsafety.co m Produc t Prepare d Fro m Officio / f A ARecord s Biy : 

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Printe d Aprl02,0 4 Pag e I t 

## ' • ' • A n alrsafety.co m Produc t Prepare d Fro m Omdo l FA ARecords-By . 

## A i rDat a Re-searc h 986 5 lov/e rView , Helotes , Teiia s 7602 3 210-695-220 4 - Fox210-695-230 1 lnfo©oirsotety.co m - www.oirsofety.co m Copyrigli t 1999;2004 A k

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## /\ n airsafety.co m Produc t Prepare d Fro m Omcia l FA ARecord s By : 

## A i rDat a Researc h 986 5 Towe rView , Heloles . Texa s 7802 3 210-695-220 4 - Fox210*95-230 1 info@airsofetyxo m - www.0ir5alety.co m Copyrig M 1999200 4 A k

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## A n airsafety.co m Produti t Prepare dFro mOmM I FAA Record s By . 

## A i rDat a Researc h 986 5 Towe rView , Helotes , Texo s 7802 3 210-695-220 4 - Fox2I(M9S-230 I k4oeaksolety.eo m - www.oirsolely.co m Printe d April02,0 4 Pagel l Copyrigli t 1999,2004 A k Data Researd ) >UtR«til s Reserve d

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## Printe d Aprii02,0 4 ' ' A n airsafety.co m Produc t Pag e 3 2 . . Prepare d fro m Ofdcid l FA ARecordsBy . 

## A i rDat a Researc h 986 5 Towe rView , Hekjtes , Texo s 7802 3 210-695-2204-Fo x210-695-230 1 info«oksofety.co m - www.oksoletyxo m Copyrigl « 1999,200 4 A k

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PIPE RPA2816 0 LYCO820A2 B AdIS N AdlRegNo . EngS N Difficult yDol e PropSN . Tofoilkn e CmplS N nm e Sinc e O/ H

N6P69 W 0&/11A 7 2878 .

4.-.••. . 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A A4127 6 33 9 TH EMOCCCSTTRO LAR M CAM EOF FO FSHAF T CAIISIN GCAR B TX ) G O T « IDL E Cni T OFT . TH EAA : MAD EA POmS ROF F LANDDN : A T A SMAL LAIRFIEL D WITH.N O DAMAG EO RINJURIE S BEIN GSUSTAIHED . UPO N INSFfiCtlO N FO RCAUSE . TH E AR M WA S FOUN D ATTACHE D T O CABL EBU T DANGUN GUNATTACHE D FRO M CARB . WTTNES S MARK S ONAR M BUSHIN G- AN D SHAF T SHO WONL Y HAL FO FGRI PLENGT H ENGAGED . ALSO , SUBMHTE RWA S imABL E T O LOCAT E TENSIO N SPRIN G AN D SAFET Y CU PI N TH EAK; . SUBMrTTE RSUGGEST ^ INS PPROCEDURE S INCLUD EA VISUA LCHEC K FO RPROPE R POSITIO N O FAR M AN D SUFFICJEN P ENGAGEMEN T FO RRETENTION . I036783 S CARBURETO RHALVE S SEPARATE D PIPERPAZ8I6 0 2890 9 N5677 W INSP/MAIN T PARTTALRPM / NON E199S11220QI8 6 LYCO320A2 B 10/29A 3 

### : * ^*« ' 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A 0 . AIRCRAF T EN(UN ENEEOED.LEANIN O T O OBTAI N MAXIMUM-RP M A T SE A LEVEL . WOUL D NO T SHU T DOWN . CLEANL Y AND . CXJUL D NtJTB B ADJUSTS . AFTE RINSPECTTON , CARBURETO RWA S FOUN D TOB ESBPAJUTTNOATTHEO T LOWE RHALVE S WHERE ; ATTACHED . SCREW S THA T HEL D HALVE D .tOGETHERWE ^ INSTALLE D WTTH ORIGINA LSAFET Y WIRE. - BOT H O FTTSflOLE S SHOWE D SIGN S O FEL($NGATT6 NAN D STRIPFINd . SUBMnTE RANALYSI S 1 $ OI H AO EAN D ..rAi^n'D FVIBRATIO N CAUSE D PAR T T O FAIL . RECOMMEN D INSRECTTON^ FCARBURETO REVER Y 10 0 HOUR S AFTE R2,80 0 HeNQiR^:£XPTBi^m^iRVICE;.''N O SIGN S OFFlIELLEAKAO B NOT ^ 3664 0 TAXI/GRN D . 4 732 2 • CHEC K VALV E FLAM E ENGIN E SMOK E FUELCONTROUCARBURETO R WOR N 197809O7OOII 7 PIPE RPA2816 1 •

LYCO320D3 G 28781618 0 MARVELSCHE B MA4SP A CK4824 0 NS882 2 ' 22 2 22 2 FOUN D EAR S O N C K VALV E LOOS E& WOR N CAUSIN GWEA RI N THREAD S CAR B BOW LLEAMN O F U E LCAUSIN GFIR E CRinS E 732 2 FLOA T

ENGIN E STOP POTHE R FUE LCONTROUCARBURETO R STOC K 197906250006 1 FLOA T STUC K

FLOODIN GENG . CUASIN GI N FL T FAILUR E' J9468 I INSP/MAIN T 732 2 PUM PPLUNGE RACCELERAT O

OTHE RNON E FUELCONTROUCARBURETO R PLATIN GFLAK E 197907130007 2 PIPE RPA2816 1 LY C O320DS G FACE T MA4SP A PIPE RPA2S16 1 LYCO320D8 G FA(;E'I'MA4SP A INS P FOUN D CAR B ACXXLERATO RPUM PPLUNGE RPLATTN O FLAKIN GOF F 16A10 7 APPROAC H 4 732 2 GASKE T

VIBRATIONffi U UNSCHE D INADEQUATE Q FUE LCONTROUCARBURETO R CU T . 198010030007 3 PIPERPA2816 1 LYCO320D3 G MARVELSCHE B MA4SF A 28791606 3 L856SS9 A CK61162 8

CK61I8 7 28791680 8 L918439 A CK7I646 T N2217 9

9 0 9 0 N2FO R 26 0 26 0 N2884 N . 79 8 79 8 EN GROUG H + WOUL D ONL Y RU N ATIDL ESPEEDS.FOUN D PIEC EO FGASKE T INSID ECAR B LOD GE D I N P/ N 47-82 8 N07XI K A23361 6 TAXWJRN D 732 2 NEEDlE•^SEA T TI P O F

FLAM ENON E FUE LCONTROUCARBlrilETO R GROOVE D 198107080007 7 PIPE RPA2816 1 LY C O320D3 G 28781663 7 L840439 A MARVELSCHE B MA4SP A CK610W 1 N3645 1 375 ' 37 5 CAR B FLOODE D BEFOR ESTAR T RESULTIN GI N COW LFIRE . CAUS ENEEDL E+ SEA T DI D NO T C LOS EQFFFVJ^ U

Printe d April02,0 4 Page4 5 

## A n airsafety.co m Produc t Prepare d Fro m Officia l FA ARecord s By : 

## A i rDat a Researc h 986 5 Towe rView , Helotes , lexo s 7802 3 210-695-220 4 -Fo x210-695-230 1 inloeciksotety.co m - wvnv.oksofetyxo m Copyrigti l 1999,2004 A k

Da b Reseaitt i AIRigl«sRe|sen« d

^'v iPortNo . SfogeOp m Severil y AT ACod e Remark s TABS . Por

t Nom e Nolur e olCon d 1

. Natur e o l Con d 2 AT ATe?( l Por t locatio n PrecPro cT Pre cPro c2 PortCondRk m

RplCMNo . Operato r A d l Mfr/Md l

En g Mfr/Md l Pro p Mfr/Md l Criv l Mk/Md l AdIS N AdlRegNo. - - tngS H fimciMyOplc. frop.S N TotalTkii » Cmp I S N Tkn e Shic e O/ H



## ( ] MDCTUR E OTHE R SEPARATE D

197508010004 1 PIPERPA2818 0

LYCO360A4 A 28492 9 N6497 J ACnVATTN GAR

M CtOJlS E OTHE R WAFFECTSYST E185 0 732 2 . FUELCONTROUCARBURETO R. MARVELSCHE B MA4SP A 136 0 DURIN GFUGH T CAR B MI X OON T ACTNATi mAR M SEPARATE D FRO M TH ESHAFT.TH S BOS S I N TH EAC T AR M UPPE REN D WASELONQATE D ' ' ^ _ 10621 7 CARBURETO RBOW LDRAI N LEAKIN GPIPE RPA2818 q28722666 9 NlSOB O INSP/MAIN T FLUIDLOS S NON E199706150039 8 LYCOSlMDS GL2262227 A OS/DIAT 4 • " 0 732 2 FUELCONTROLrtMlBimETO RMA4SP A 0 . ' TW O BOW LSCaiBWSLEAiaNG . FllE LBOW LDRAI N LBAKn<IG . BOTT0M'OF<MRBURETO RSMAL LHOUSIN GO F ACCELERATO RPUM PLJBAKINQ . VER Y POO RQUAUT Y ASSURANCE . SUBMTTTE RSTATE D ALS O SAM EPROBLE M O N A N OVBRHAULEDMODBL-SAMEP/N , 1»8217 . ' - • . - ' MA4SPA1.0521 7 CARBURETO R NO TFLUI D LOS S 4 732 * FUELCONTROUCARBURETO R FUE LLEAKIN O PRO M BOD Y O FCARBTJRETO RWHE N ENOIN B I S SHU T DOWN , MIXTUR EVHI Y RICH . TOTA LTTM E O N UNI T I S (0) . CARBURETO RREM'OVE D FO RWARRANTY . OVERHAULE D CARBURETO RINSTAUED . GROTIN D OPERATIO N CHECKE D NORMAL . ^ • ENGIN E OTHE R JRETO R LEAKIN Q .

200203160012 1 VJ3 R PIPERPA2818 1

LYCO960A4 M 284320 4 N4180 W RL37Q40< « 02Q7/D 2



### 0

12B6 7 THROTTL EAR M CARBTHIBTORHOL EMISLOCATE D ROBSI N R22BBT A 105 5 N2FO R INSP/MAIN T INADEQUAT E Q NON E19890719000C B 06n6« 9 4 • 0 • 732 2 FUELCONTROUCARBURETO RFACE T MA4SP A D<^330 8 0 MANUFACTURIN GDEFEC T O N NE WPAR T WHERETH ETHROTTL ESHAF T HOL EWA S MACHINE D APPROXIMATKL Y aO2 0 INC H ECCENTRI C T O TH E CENm RO P TH ESERRATTO N PATTERN . THI S CAUSE D TH ETW O SERRATE D PART S T O B EOU T O F EN0AGEMEOTANDTHEPARTSW0ULDN0TU)CKTOGBTHBRWH£NCMMPRI>WITHtHE81-31lNUT . . 10601 8 BOW LMISMANUF;ACTUR B ROBSI N R22BET A 141 3 N2FO R INSPMAIN T INADEQUATE Q NON E199009120oi « LYC;0320B2 C MHMOO . 4 0 732 2 FUELCONTROL/CARBURETO RFACE T MA4SF A DC4641 0 0 PUM P DISCHARG ECHEC K VALV E ASSEMBL Y (P/ N 36-640 ) POUN D T O BB.<3tOS S THREADE D O RTH EB0WL'(P/ N10-6018 ) WA S MACHINE D OU T O FSQUAR E SUC H THA T A GA PO F.01 6 INC H O N I SID EO FP/ N 16^B4 6 COPPE RGASKE T EXISTS . THI S CAUSE D A STEAD Y FUm > LEA K A T AL LTIMES . THI S I S ANE WUWT . 2919 4 FLOA T VALV ESPRIN GCU P DEFECTIV EAMTRRV 4 165 0 N22D D INSP/MAIN T OTHE RNON E199906220006 2 LYCO320E8 D RL319692 T 0S/18A S 4 • 160' . . . 732 2 FUELCONTROUCARBintETO R. FACETMA4SP A BL16S66 9 0 I ^ WDESIG N FLOA T AN D VALV E ASSEMBLIE S USE D WIR E RETRACTTO N DEVK X T O PROVID EPOSnrV ERETRACnO N O F TH E FLOA T VALV E NEEDLE . TH E SPRIN GWIR ECU PIX>ESNOTAPPEARSTTtON GENOUG H T O POSITIVEL Y RETRAC E NEEDL E VALV EFRO M SEAT . IHI S PROBLE M CAUSE D TH ELOS S O FENGIN E OUTPUT . INSP/MAIN T 

# w 716 0 FILTE R

OTHE R AIRINTAK E AIRINTAK E DETERIORATE D MOONE Y STCM2 0 113 7 LY C 0320 /

L70882 7 MARVELSCHE B MA4SP A 398667 2 REFE RT O SreSA69N WPIEC E O FFILTE RLODGE D I N VENTUR I RIC H MIXTTfll EAN D ROUG H EN GN FUPH T RJ024I O TAKEOF F 

### W 716 0 CARB AI RBO X

OTHE R AFFECTSYST E AIRINTAK E WE B BROKE N NON E197409060003 2 PIPE RSTCPA2 3 2341 2 LYCO320A3 A 4052 7 MARVELSCHE B MA4SP A N5274 B 

### 17 0 77 0 N203 S 

### 17 8 17 8 EN GPOWE RLOS S DU B T O WE B BROKE N I N CAR B AI RBO X SnCKIN GI N CAR B THROAT£AR B A l RBO X I S ST C INST LWIT H RAJAYTUHB O 

# \ Pikile d /Vpri i 02,0 4 Pag e 4 8 

## A n airsafetyJco m Produc t Prepare d Fro m OmcM I FA ARecord s By . 

## A i rDitt a Researc h

. 986 5 Towe rView . Hetoies . Texo s 7802 3 21(^695-220 4 - Fox21<>69S-230 1 inloeoksofety.co m - www.oirsafely.co m Copyrigh t 1999,200

4 A k Dat a Researet i Af/^MsRaMrve d



# •C Q 

# J J

## / ~ ) PortNo . StoaeOpn s ievetH y AT ACod e Remoric s ' Par

t Nom e Natur e o l Cond i Natur e o l Con d 2 AT ATex t Part Locatio n

Pre cf IOC 1 Pre cPro c2 PortCondmo n

RplCMNo . Operato r' Ad l Mfr/Md l

En g Mfr/Md . PropAUr/Md l C n ^ Mfr/Md l AclS N

EngS N PropS N CmplS N Acf l Re g No .

CMicutyDal e . Tota l %n # . , Tkn e Skic e O/ H . 

### S12221 9 CONTRO LTHROTTL ECRACKE D CESSN A 17 7 1770034 2 N294Z X INSP/MAIN T OIHE RNON E199S07280037 8 07/13/9 6 4 T41 S 7603 . POWERLEVE RFACErMA4SP A A111231 0 0 DURIN GA SCHEDULE D INSPECTION , FOUN D THROTTL ECABL EBEN T AN D CRACKE D ATTH EBEN D LOCATE D A T THE , THREADE D EN D WHER ETH ERO D EN D ATTACHE S T O TH ECABLE . T T APPEARE D WHE NTH ETHROTTL B HI T TT S STOP . TH E THROTTL ECABL ECONTINUE D T O B EPUSHED . TH ECABL EHA D T O B EREPLACE D WHIC H I S VER Y (XJiglLY . STD1763 : PA LNUT S INSP/MAIN T OTHE R 4 INADEQUATE Q 732 2 FUELCONTROUCARBURETO R PA LNirr S MISSIN GO NCAR B ATTAC H NUTS . CAR B ATTAC H MISSIN G NON E198511290011 6 CESSN A 172 P LY(TO320D2 J MCAUL Y 1C160DT M FACE T MA4SP A 17216148 2 N12aE B ' Lis«g639 A lont/e s e57VBt3 1 0 CKtlSS S 0 A3062 8 INSP/MAIN T 4 . 732 2 FIJOAT/LEVE R



### OTHE R CARBBOW L NON E BROKE N

198112230003 0 FUE LCONTROUCARBURETO R PIPE RPA1816 0 . LYC032QA2 B MARVELS(aiE B ' 187S9 3 . ' N3839 Z L119602 7 0 399094 9 0 TH EFLOA T AN D LEVE RASSEMBL Y P NA30-62 8 SEPARAT'E D A T LEVER . PART S FEU , INT O BOTTO M O FBOW U 23361 5 VALV E LANDIN GFLAM EOTHE R 4 FLUI D LOS S 732 2 FUE LCONTROUCARBURETO R SCOR D PIPE RPA2815 1 198507310007 2 1.YC 0320E3 D

FA<?E T MA4SPA10eQ09 ; 28771612 8 N6418 F L4a4027 A 92 8 BL221417 6 92 8 JUS T AFTE RTOUfMDOW NTH EEN GSTALLED . O NRESTAR T ATTEMP T CAR B HEA T BO X CATKJH T FTR EFOW^DSrUC K VALV EI NFUE LBOWL . AS075 9 . FTJOA TBOW LSATURATE D

. INSP/MAIN T FLinDLOS S NON E198104300004 7 ( ) . 4 . 0

732 2 FUELCONTROUCARBURETO RMARVELSCHE B 81^978 3 0 CAR B REMOVE

D FO RLEAKING . FLOA

T WEI(»IE D 30. 7 GRAMS . NE WFLOA T WEI(3HE

D 1X6 GRAM S 10601 8 BOW

LLOOS ECESSN A 172 N 1726801 $ N7S87 9 NO T OTHE

RNONE198102230021 1 LYCO320H2A D RLUTTe 4 145 2 732 2 FUELCONFROUCARBURETO RMABVELS(3HE B CKM90 0 146 2 . CAR B BOW LHOUSINGLOOS E ORIGINA LLOC K WASHERS STII X I N TACT . ENGWOIRJ ) SHIT T OF FWTT

H ONL Y MINIMA

L CONTROLMOVEMEN

T . .13152 1 INSP/MAIN T 4 ' 732 2 SHAF

T THROTTL E OTHE RNONE FUE LCONTROUCARBURETOR WORN/EX C 198212130004 0 CESSN A 172 N LYCO320H2AO MARVELSCHE

B EXCESSIV E PLA

Y I N CAR

B THROTTL

E ASSY . REPLACE

D THROTTLESHAF

T AN D BUSHINGS . 13152 1 INSP/MAIN T 4 732 2 SHAFT THROTTL E OTHE RNONE FUELCONTROUCARBURETO R FOin mCAR

B THROTTLE SHAF

T WOR K WOR N 198301040008 7 CESSN A 172N LYCO320H2A

D MARVELSCHE

B 1737091 T

L44&47 6 CK4884F .1726S060 Ll66e7 6 CK3656 2 NTSgT

R 63 8 83 6

t 

### N734RG 114 8 114 8 13152 1 SHAFTffiUSH I MAI

N WOR

N CESSN

A 172 N 1721220 4 N8449 B INSP/MAIN T OTHE

RNONE 198212130003 9 LY C O320H2A

D Ls<207 6 4 130 1 732 2 . FUELCONTROUCARBURETO RMARVELSCHE B C1612807 130 1 CAR B THROTTLESHAF T AN D BUSHING S WOR

N BEYON

D SETTTN

O IDLE FO

RSAM ERP M EAC H TIM ECL03H) . Printe d Oecambe r12,0 2 Pag e 8 7 

## A n airsafehf.co m Produc t ' Prepare d Fro m Officio l FAARecorci s By : Copyrigli t 1999,200 2 A k Dat a Researc h Alf«gtilsR«seiv<a d 

# Ai r Dat aKesearie h 1343 8 Bander a Rood , Suit e 106 . Heiotei . Texa s 7802 3 . 21(M95-2204-Fax2HW95'230 l kifoOqhofetyxo m - www.oiraolety.co m

# r r lB/al/298 4 13:5 1 303465411 6 AERD5C0P E IN C PAa E 8 2



## / I N TH E CBRCXn T COURT . SBVBNt H JUDICIA LCIRCUIT , I N AN D FOR . VOLUSI A COUNTY , FLORID A MAR K GODFRE Y an dNICHOLA S GRACE , Pkintifib , vs . PRECISIO N AlRMOnV B CORPORATION , ZENIT H FUE LSYSTEMS , INC. , PRECISIO N AEROSPAC E CORPORATION , PUROLATO RPRODUCT S COMPANY . FACE T FUE LSYSTEMS . INC ^ FAC8 T ENTERPRJSBS . INC , FACE T AEROPAC B PRODUCT S COMPANY , MARVBL-SCHEBUBR , a. divino n o f

BORO-WARNE RCORPORAT[0N , TBLEDYN E CONTINENTA LMOTOR S AJRCRAF T PRODUCTS , adivisio u o f TBLEDYNE , INC. , and/o r ALLEGHEN Y TELBDYNE . INC , TBLHDYN B INDUSTRIE S INC. . ALLEGHEN Y TBLEDYNE , INa , TBLEDYNE , ma , TBLEDYN E TBCHNOLOQIES , INCORPORATM J TRW , mC , OB A MAINTENANC ESERVICES , INC. , an dORMON D BEAC H AVIATION , INC. , CAS ENO. : 2001-30640-CIC I JUDG E JOH N R . WATSON , I H

AFFIDAVrrO F DONAL D B . SOKIME R

BEFOR E MB , fhi

e undeimgae dauthority , personall y appeare dDonal dB . Sommer , wh o i s personall y know n t o me , who . upo n bl aoath , depose dan datats da s follows: 1 . I auPtcdidtn t

an dowTu r

o f Aeroscope^Inc^Bioanifidd , Colorado . Aeroacope ^ hjD . i s involve di n fiuensic engineedng . oanqtute r modeling , an d&i)iii; e analysi s ofaiifiamea,eQgne 8 an dainsraf i systems . I a mameduunca l enginee r wit hFA A pilo t xating aa s a n Airiin aTmupoc t Pilot , Connnetcia l Pilot , Fli ^ Instructor , Groun dbiBHuctor . an dAirfian w an dPowerplan t Mechanic . I als o hol da n FA A Dupectio aAufliorization . M y engineerin g eaqpenenc e inchide s mechanica l an d hydnuili c system s desig n an dtesting ; instxunuDtatiaa . desis aan di^oduotio n o f iic w product s an dsttb-componeots , an dfidluie analysis . I hav e ove r 16.00 0 hoar s a s pUo t i n comnum do f

aizcraf t o f al l ^a* , ioohidiii g je t

an dplsto aengin e airanaft . I hav e owne dan dop«rate dairotsf i maintenanc e ftKlUtie s an dbosines s ainraft . I ha.v e conducte doumeiou s airciaA acciden t tnvestigaiion s an d AfiUavHorDou U B . SoonwOodfrt y rt«>i«f 7 fMC8lv«< i OctH»-n» 4 MA I FfO.-U34«54U e To-TH E W W lA I H W f* f « «

## ia/»l/M» 4 13:5 1 383465411 6 SERCBCOr e IH C TM ^ " 

# n

n reconsttuctions . wreckag e inspecdoos , an dcoosnlte di n man y aircraf t acciden t cases . I hanr

e bee n enoploye db y flie Plaintiff, Messe s Qodfie y an dGrace , a s a n aviatio n consultan t

t o ixxvestigaie th e cras ho f N1922 2 a t

Qrmon dBeach . Florid a o n Jul y 24,1999 . Th e Cmticnlu mVita e attache da s Exhibi t 1 t o thi s AfiSdavit

i s a tni c an dconec t

recor do f m y qualifications . 2 . I amaprio r

owne r an doperato r

o f severa l aircraf t maintenanc e ^ilitie s fo r m^o r ani dmino r repair s an dalteniiona . I als o owne dan doperate dsevera l fli ^ schools , an dca n attes t

t o th e dutie s o f

Teledyn e Continental Motor s an dPreoido n Aerospac e Corporatio n withrespec t t o warnin g fhdu

r customar s o f

potoatiAl hazaod s conceroin g thei r

products . 3 . I hav e extensiv e knowledg e an 4 experienc e withPrecisio n (formerl y Marvd Sehd)ler ) carbureto r

defects . I hav e previousl y don e extensiv e research , testin g an danalysi s relatin g t o aircraf t ciaahe s cause db y defect s i n Predstt moatbtttcton , an dprovide dtestimon y i n thre e lawsuit s fliat wen t t o tria l involvin g Precino a carbureto r dcftcts . Thes e defect s inivolve needl e valv e stidcage , prematur e part s wea r ou t that cause s hang-iqis , loos e scxew s diat attad i th e caxburetor

bow l assembl y t o th e thiotd e body , floa t iotetfoenc e withdi e float bow l an da propensity fo r

th e desig n t o caus e incorrec t mixtur e t o di e wgine . Thes e case s include : Blanto n v . Teledyne , ot aL , Albei t

Eig mv . Textro n Lycoioin & e t al , an d Nan ^ Thoma s v . Catonsvlll e Comnnmit y College , e t

al . I n dies e thre e case s an d th e Jul y 24 , 199 9 cras ha t Ormon dB^h , adej^tiv e carbureto r cause dth e crashes . Th e analysi s o f di e crashe s mad e i t

obviou s t o ti\e defendant s an d provide dfiUGScioit

notic e t o Precisio n an dTeledyn e Continental o f th e detisotiv e desig n an dmanufaoturo o f thei r carbureto r

an dth e disastrou s resul t

o f thei r fiulure t o addres s th e defects . 4 . A dsfixitiv o Piiccisio n MA-3SP A carfoinreto r wa s installe di n th e Teledyn e CoQtineata

l Motor s O-200 A i n th e Cessn aISOL . registratio n numbe r H19222 , o n Apri l IS , 1999 . Th e screw s holdin g ftacatboreto r bow l t o di e dmml e bod y becam e loos e an dth e needl e valv e wa s foundt o b e interferin g wit hth e needl e valv e seat

sud i tha t at th e tim e o f

th e accideo t

a n overl y richfiiel/air

mixtur e cause dth e engin e t o b e inoj^abl e o f SUsiainhl g fligjht 5 . Precdsion an dContinenta l filledi n diet r dut y t o war n di e operator s an duser s o f thi s know n defec t

i n th e Piecisic mMA-3SPA carburetor . Th e Fodeta l Aviatio n Administratio n ntajntajmi

H aServic e DifiEloult

y Datalias e that

document s numoou s problem s wit htbi s caiburetor , includin g loos e bow l screw s an dfloat stidcage , datin g bacJ

c t o th e 19708 . BothconqiaQie s hav e ha danqpl e tim e t o addres s flaws i n th e desig ao f

di e carbureto r

o r warn o f di e exac t shortcoming s tha t

le dt o thi s an dothe r catastrophes . 6 . TeKtnmLycoming , anothe r aircraf t aosin e manutaotnroc , di dwar n o f th e loos e scre w pn^le mwid i Servic e BuUed aNo . 366 , issue do n Septembe r 14 , 1973 . Thi s bulleti n warn s t o inspec t for fue l stain s an dloos e flirottle bod y attachin g

AtOanl t o r DonaldCSoRamr-Codaa y P«se2af 7 

## R««.lv«i 0«t-01-t00

4 15: U Pr«-J0S4»8411 «

# r r iem«« 4 13:5 1 3.3465411 6 ««C « » « P*^ " 

# 1

" ) screw s o n al l Lycomin g eagine aequqtpe dwit hMarvel-Schebie r carbur^ors . Thi s i s d w sam e typ e caibureto r a s installe do n di e Continenta l engin e o n th e arcidwDE t aircraft . Ili e bulleti n require s insurin g di e screw s ar e d^itene dt o th e ooireo t torqu e o f 4 0 t o S O itici hpoiinds , an dmandate s dd s b e aeeooqilifihe da t eac h 10 0 hou r inspection . Ha dPrecisio n o r Continenta l issue dasimila r servic e bulleti n o r warnin g for

aircraf t wit hContinenta l engines , thi s crat hcoul dhav e bee n avoided . 7 . Precisio n an dContinenta l ha daduQ r t o inprov e th e MA-3SP A carfouretor an d infor mth e FA A o f

diel r product' s ftaws. Ther e i s n o recor ddi e nunu&cturer s attempte dt o bmptav c thei r fiulty produc t

FA R$33.3 5 Relate s t o standard s for airworthines s o f

aircraf t engin e fii dan dioducdo n systems . I t states , "Th e fue l syste mo f

th e engin e mus t

b e designe datx l constructe dt o siqjpl y a n appropriat e mixtur e o f

jSoie l t o dve cylinder s ibraa^aatx t th e complet e operatin g rang e o f di e engin e unde r

al l flight

an datmospheri c condidons. " Th e MA-3SP A i s no t i n complianc e ^d i thi s regulado n becaus e i t ca n siQiply a n oveil y ric hnuxtur e durin g cridoa l phase s o f flight I n thi s an dnumerou s othe r oiaabe s aloos e cartnireto r

bow l an ddsfoctive'needl e valv e an dsea t oauoo dth e ainraf

t t o b e incapabl e o f

sustainin g fli^t

Tbi s proble mcoul dhav e beo aremedie dan dwoul d hav e prevente ddii s crash . 8 . FA R$2'l.3(& ) state s "Bxcq;>t a s provide di n paragrap h(d ) o f thi s section , tfie holde r o f al^ e Cerdfical e includin g aSiyplwroenta l Typ e Certifioate) , aPart s Manuficture r

Approva l (PMA) , o r

aTS O authorization , o r

di e license e o f

aTyp e Certificat e shal l repor t

an y JMute, - malfimctjon , o r defec t o f an y product , part , process , o r

articl e mami&cture db y i t tha t i t determine s ha s resulte di n an y o f th e occurrence s liste di n paragrap h(c ) o f thi s section.* * - Paragrap h(c ) state s "Th e following occuncnco amus t b e rqporte da s provide di n paragraph s (a ) an d(b ) o f tbi s section : (10 ) A n csigili c dilute. " Th e MA>3SF A infft^^U*

^ o n th e engin e wa s ne w an dcam e wid i a n FA A For m 8130- 3 - Aizwordunes s Approva l Tag . Th e wordin g o n bloc k 1 4 o f di e 8130- 3 states : "Cetdfie s tha t

di e ne w o r

newl y overhaule dpart(8 ) identijBe dabove , excep t a s otherwio o specifie di n bloc k 1 3 wa s (wero ) manufii^ure di n accordanc e -wit h FA A ^i^rove ddesig n dat aan dairworthiness. " Th e prooedure s for completio n an dus e o f

th e 8130- 3 ar o containe di n FA A Orde r 8130-2 1 A . Unde r

paragrqi h7 o f till s order , th e followin g not e i s ^^Ucablc : *n[1i e issuanc e o f

th e formi n n o wa y affect s th e manu&oturer' s obligatio n lude r Par t 2 1 t o conqil y v/Hk

it s approve dqualit y system , an dt o ensiv e ever y produc t presente dt o tiieFAAorit s designee s for

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operation . Th e <itkaCt y oontxo l syste meo^ioye db y di e tnanufactmrer afitiledi n thi s instanc e an dnamerou s other s documente db y th e FA A an dm y inveadgadons . ASUnit«fr>(MUEScn<mw-09«k v I>iae3«f 7 ( ) • . 

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# McSwai n Engineering , Inc .

Material s Engineerin g Investigatio n Supplementa l Repor t Godfre y & Grac e v . Precisio n Airmotiv e Corp. , e t a l Februar y 21 , 200 6

McSwai n Engineering , Inc . Kngineerin g Authorizafio n No . 633 8

# McSWAIN ENGINEERING , INC . 332 0 McLemor e Driv e P.O . Bo x 1088 8 Pensacola , Florid a32524-088 8 (850)484-0506 FA X (850 ) 484-0508 

# Material s Engineerin g Supplementa l Repor t

Februar y 21,200 6 Reference : Acciden t Aircraft ; Acciden t Engine : Acciden t Date : Acciden t Location : Godfre y& Grac e v . Precisio n Airmotiv e Corp. , e t a l Cessn a 150L , N1922 2 Teledyn e Continenta l O-200-A4 8 Jul y24 , 199 9 Ormon d Beach , F L 1. 0 Introductio n

Additiona l laborator yexamination s an d analysi s hav e bee n performe d relate d t o th e investigatio n o f th e subjec t faile d Precisio n Airmotiv e MA-3SP Acarburetor , P/ N10-4894-1 , S/ N 75082908 , sinc e th e initia l material s engineerin g repor t date d Decembe r 17 , 2003 . Bot h laborator yan d fiel d testin g o f Precisio n Airmotiv e MA-3SP Acarburetor s an d fiel d testin g o f a Precisio n Airmotiv e MA-4SP Acarbureto r hav e bee n performed . Thi s supplementa l disclosur e describe s thos e activitie s an d finding s whic h furthe r suppor t m yopinion s i n th e subjec t case . Th e procedure s utilize d i n thi s engineerin g investigatio n wer e i n accordanc e wit h AST M E2332 - 0 4 an d hav e bee n accepte d an d presente d i n U.S . federa l courts , stat e courts , an d Canadia n courts . 2 . 0 Precisio n Airmotiv e MA-3SP A(Teledyn e Continenta l 0-200-A )

vs . Precisio n Airmotiv e MA-4SP A(Lycomin g O-320-E2D ) Carbureto r Vibratio n Testin g Vibratio n test s wer e performe d o n a Precisio n Airmotiv e MA 3SP Acarburetor , P/ N10-4894- 1 o n a Teledyn e Continenta l O 200- Aengin e installe d i n a Cessn a 150 L aircraft , a s show n i n Enclosur e 1 . Th e carbureto r wa s instrumente d wit h tw o triaxia l PC B Piezotronic s mode l numbe r 356A1 6 accelerometer s

# I whic h measure d vibratio n i n bot h th e vertica l axi s a s wel l a s th e tw o horizonta l axes . Bot h th e throttl e bod yan d the bow l r * wer e instrumented . Th e vibratio n dat a obtaine d showe d tha t I significan t carbureto r vibratio n occurre d throughou t the

operationa l RP M rang e o f th e engin e an d tha t th e maximu

m acceleration s exceede d 2. 0 G s verticall yand 1. 1 G s horizontally . Vibratio n test s wer e performe d o n a Precisio n Airmotiv e MA 4SPAcarburetor , P/ N10-500 9 o n a Lycomin g O-320-E2 D engin e i n a Cessn a 172 M aircraft , a s show n i n Enclosur e 2 . Accelerometer s wer e mounte d i n a simila r manne r t o th e tes t performe d o n th e Teledyn e Continenta l O-200- Aengin e carburetor . Significan t carbureto r vibration s wer e measure d throughou t th e operationa l rang e o f RPM s fo r the Lycoming O 320-E2 D engine . Th e maximu macceleration s measure d exceede d 0. 9 G s verticall yan d 1. 7 G s horizontally . Vibratio n test s wer e als o performe d o n a Precisio n Airmotiv e MA-3SP Acarburetor , P/ N10-4895-1 , o n a Teledyn e Continenta l O-300- D engin e installe d i n a Cessn a 172 H aircraft , a s show n i n Enclosur e 3 . Th e vibratio n dat a obtaine d showe d significantl yles s carbureto r vibratio n throughou t th e operationa l RP M rang e o f th e engine . Vibratio n test s wer e als o performe d o n a Precisio n Airmotiv e MA-4SP Acarburetor , P/ N10-3678-32 , o n a Lycomin g O-32 0 engin e installe d i n a Pipe r PA28-14 0 aircraft , a s show n i n Enclosur e 4 . Th e vibratio n dat a obtaine d showe d significan t carbureto r vibratio n throughou t th e operationa l RP M rang e o f th e engine . Compariso n o f th e tes t dat a fro mth e Teledyn e Continenta l 0 - 200- Awit h a Precisio n Airmotiv e MA-3SP Acarbureto r t o the Lycomin g O-320-E2 D engin e wit h a Precisio n Airmotiv e MA-4SP A carbureto r reveale d tha t bot h engine s demonstrate d significan t and comparabl e vibration s actin g o n th e carbureto r i n bot h th e vertica l an d horizonta l axes . 3. 0 Precisio n Airmotiv e MA-3SP ACarbureto r Float/Needl e Valv e

Buoyanc yForc e Testin g Test s wer e performe d t o measur e th e Precisio n Airmotiv e MA SSPAcarbureto r floa t buoyancy-induce d forc e o n th e needl e valve . AMA-3SP Acarbureto r wa s drille d t o acces s th e top o f th e needl e wit h a forc e gauge . Stoddar d solven t wa s use d t o lif t th e floa t an

d th e needl e positio n an d forc e wer e r,g f 2 o l 1 4

# measured , a s show n i n Enclosur e 5 , Th e buoyancy-induce d forc e actin g o n the needl e a t a n opening positio n o f 0.02 6 inche s wa s 0.9 1 ounce s (0.05 9 Ibf) . Th e floa t buoyanc yforc e vs . needl e dro p i s show n graphicall yi n Enclosur e 5B . 4. 0 Precisio n Airmotiv e MA~3SP ACarbureto r Needl e Valv e Retracto r

Cli p Forc e Testin g Test s wer e performe d t o measur e the Precisio n Airmotiv e MA SSPAcarbureto r needl e valv e retracto r cli p force . Aforc e gaug e wa s attache d t o th e needl e valv e an d th e forc e induce d b yth e float s through th e retracto r cli p wa s measured , a s show n i n Enclosur e 6 . Th e maximu mneedl e retractio n measure d wa s 2. 5 ounce s (0.15 6 Ibf) . 5 - 0 Carbureto r Materia l Selectio n Comparison s

Th e Precisio n Airmotiv e aircraf t carbureto r i s a derivativ e o f th e origina l Marvel-Scheble r tracto r carburetor , a s show n i n Enclosur e 7A . Th e origina l Marvel-Scheble r tracto r carbureto r utilize d a stainles s stee l needl e valv e i n a bras s seat , a s show

n i n Enclosur e 73 . Stainles s stee l contactin g bras s i s a know

n defectiv e wea r coupl e whic h result s i n excessiv e wea r t o th e brass . Precisio n Airmotiv e acknowledge d tha t stainles s stee l o n bras s i s a defectiv e wea r couple , a s cite d i n Unite d State s Paten t 5,385,69 7 issue d t o Precisio n Employe e Rand yJensen , th e paten t incorporate s materia l improvement s tha t provid e increase d wea r benefit s b

yincorporatin g a stainles s stee l needl e valv e an d a stainles s stee l spring cli p instead o f th e prio r desig n tha t consiste d o f th e stainles s stee l needl e valv e an d th e bras s floa t plate . Acurren t design Ford P/N8N9510 C tracto r carburetor , whic h i s base d o n the origina l Marvel-Scheble r tracto r carbureto r design , i s show

n i n Enclosur e 8 . Th e Ford tracto r carbureto r appear s substantiall ysimila r t o th e origina l Marvel-Scheble r design . However , th e needl e valv e materia l selectio n i n th e curren t For d tracto r carbureto r ha s change d t o a bras s needl e valv e i n a bras s seat . Th e origina l Marvel-Scheble r (Precision ) MA-3SP Aaircraf t carbureto r desig n utilize d a bras s floa t attache d t o a bras s floa t plate . Th e desig n wa s subsequentl ychange d t o a composit e floa t material , bac k t o a bras s floa t material , the n t o a hollo wpolyme r floa t material , an d mos t recentl yt o

' ' Psg a3 o f 1 4

# a soli d polyme r floa t materia l attache d t o a stainles s stee l floa t plate . Th e change s i n floa t desig n wer e mad e du e t o malfunctio n o f th e fue l meterin g syste man d floa t interactio n wit h th e needl e valve . Th e hollo wpolyme r floa t versio n o f th e Precisio n Airmotiv e MA-3SP Acarbureto r i s show n i n Enclosur e 9A . Th e hardnes s o f th e stainles s stee l needl e valve , a s show n a t th e arro w i n 9A , i s 2 9 HR C an d th e sea t hardnes s i s 7 1 HRB . Th e differentia l hardnes s result s i n accelerate d wea r o f th e needl e valv e sea t i n th e MA-3SP Acarburetor . Marvel-Scheble r (Precision ) MA4- 5 carburetor s hav e bee n examine d whic h utilize d a stainles s stee l needl e valv e an d a stainles s stee l seat , a s show n a t th e arro w i n Enclosur e 9B . Th e MA4- 5 needl e valv e hardnes s i s 3 1 HR C an d th e sea t hardnes s i s 2 8 HRC . Th e origi n o f th e Marvel-Scheble r stainles s stee l needl e valv e an d stainles s stee l sea t desig n i s unknown . N o Precisio n Airmotiv e document s hav e bee n produce d t o dat e t o indicat e th e histor yo f th e stainles s stee l needl e valv e an d stainles s stee l sea t materia l combination . Exempla r automotive-typ e carburetor s wer e als o obtaine d an d evaluate d fo r th e needl e valv e an d sea t materia l selectio n combination . A n Edelbroc k P/ N140 5 automotiv e carbureto r i s show n i n Enclosur e lOA . Th e needl e valv e assembl yutilize s a bras s needl e i n a bras s seat , a s show n a t th e arro w i n Enclosur e lOB . ADemo n P/ NBG428201 0 automotiv e carbureto r wa s als o obtaine d fo r evaluation , a s show n i n Enclosur e 11 . Th e Demo n carbureto r needl e valv e assembl yutilize s a bras s needl e i n a bras s seat , a s show n a t th e arrow s i n Enclosur e ll Aan d IIB . Th e Demo n desig n als o provide s ventin g o f fue l a t th e needl e valv e tip , whic h provide s a pat h fo r fue l flo w an d debri s t o exi t th e needl e valv e a t th e ti p o f th e needle . AHolle yP/ N0-8057 0 automotiv e carbureto r wa s als o obtaine d fo r evaluation , a s show n i n Enclosur e 12 . Th e Holle y carbureto r needl e valv e assembl yi s simila r t o th e Demo n carbureto r assembl yan d utilize s a bras s needl e i n a bras s seat , a s show n a t th e arro w i n Enclosur e 12 Aan d 12B . Th e Holle ydesig n needl e valv e i s als o vente d t o allo w fue l flo w an d debri s t o exi t th e valv e sea t a t th e ti p o f th e needle . Th e Holle ycarbureto r desig n encompasse s a bow l overflo w ven t whic h preclude s fue l fro menterin g th e carbureto r throa t i n th e even t o f a stickin g needl e valve .

- —- _____ _

# ABM W Bin g P/ N1311133808 9 motorcycl e carbureto r wa s als o obtaine d fo r examination , a s show n i n Enclosur e 13A . Th e BM W carbureto r needl e valv e assembl yals o utilize s a bras s needl e i n a bras s seat , a s show n i n Enclosur e 13B , Th e BM W motorcycl e carbureto r incorporate s a fue l bow l overflo w drai n i n orde r t o preven t excessiv e fue l i n th e bow l fro menterin g th e carbureto r throa t area . Examinatio n o f a Hond a motorcycl e carbureto r reveale d a simila r feature . Acompariso n o f th e material s utilize d an d hardnes s o f th e variou s needl e valve s an d seat s reveale d tha t th e Precisio n Airmotiv e MA-3SP Aneedl e valv e an d sea t materia l combinatio n i s th e onl ycombinatio n t o hav e a significan t hardnes s differentia l whe n compare d t o al l th e othe r carbureto r needl e valve s an d seat s examined . Th e material s utilize d an d th e hardnesse s o f eac h th e exempla r needl e valve s an d seat s ar e give n i n Enclosur e 14 . 6. 0 Precisio n Airmotiv e MA-3SP ACarbureto r Throttl e Body-to-Bow l

Fastene r Residua l Torqu e Testin g Ane w Precisio n Airmotiv e MA-3SP Acarburetor . Enclosur e 15A , wa s evaluate d fo r residua l torqu e conditio n o n th e throttl e body-to-bow l fasteners . Th e fastener s wer e marke d fo r locatio n an d th e breakawa ytorques , a s wel l a s th e fastene r re-torqu e values , wer e recorded . Th e Precisio n Airmotiv e MA SSP Acarbureto r torqu e specificatio n fo r th e throttl e body to-bow l fastener s i s 3 5 t o 4 5 inch-pounds . Th e ne w carbureto r re-torque s wer e foun d t o rang e fro m2 2 inch-pound s t o 2 7 inch-pounds . Th e initia l assembl yclamp-u p force s du e t o fastene r torqu e ar e los t i n th e Precisio n Airmotiv e carbureto r assembl ydu e t o compressio n se t o f th e gaske t material . Area s o f compressio n se t o f th e Precisio n Airmotiv e MA-3SP Agaske t materia l ar e show n a t th e arrow s i n Enclosur e 158 . Numerou s use d Precisio n Airmotiv e MA-3SP Acarburetor s wer e als o evaluate d fo r residua l torque . Th e throttl e body-to bow l re-torqu e value s range d fro m0 t o 7 inch-pounds . 7. 0 Precisio n Airmotiv e MA-3SP ACarbureto r Gaske t Materia l

Compressio n Se t Testin g Acree p relaxatio n tes t wa s performe d o n Precisio n Airmotiv e MA-3SP Acarbureto r gaske t material , a s show n i n Enclosur e 16 ,

_____ _

# pe r th e procedure s give n i n ASTM F38-00 . Th e compressio n se t test s showe d tha t th e MA-3SP Agaske t materia l wil l relax b y 0.000 7 inc h i n 8 0 minute s an d 0.000 9 inc h i n 2 2 hours . A simila r tes t wa s performe d o n a Precisio n Airmotiv e MA-3SP A carburetor . Afte r 1 hour , 36 % o f th e clampin g torqu e wa s lost . Examinatio n o f th e Bendi x (Precisio n Airmotive ) RSA- 5 Fue l Injecto r Serv o Assembl ytechnica l manua l an d servic e bulleti n reveale d tha t Precisio n Airmotiv e require s a re-torqu e o f fastener s o n th e fue l injectio n regulato r hol d dow n screw s 1 0 minute s afte r origina l assembly . Thi s re-torqu e requiremen t acknowledge s th e compressio n se t characteristic s o f th e gaske t materia l i n the Bendi x (Precisio n Airmotive ) RSA- 5 fue l injecto r assembl ybody . However , Precisio n Airmotiv e ha s neve r require d tha t th e torqu e o n th e MA-3SPAcarbureto r fastener s b e checke d afte r carbureto r assembly . Lycomin g ha s issue d Servic e Bulleti n 36 6 fo r Precisio n Airmotiv e carburetor s whic h require s tha t th e torqu e o n th e throttl e body-to-bow l fastener s b e checke d ever y10 0 hours . Neithe r Precisio n Airmotiv e no r Teledyn e Continenta l ha s eve r issue d a servic e bulleti n requiring the re-torqu e o f th e throttl e body-to-bow l fastener s o n the MA-3SP Acarburetor . 8. 0 Precisio n Airmotiv e MA-3SP AFastene r Clampin g Forc e Testin g

Th e fastene r clampin g forc e acting o n th e throttl e body-to bow l join t wa s measure d usin g pressur e sensitiv e film , a s show n i n Enclosur e 17 . Assembl yusin g 4 0 inch-pound s fastene r torqu e reveale d a non-uniformclamping forc e o n th e gaske t betwee n th e throttl e bod yan d th e bowl . Th e pressur e betwee n th e tw o closel yspace d fastener s wa s approximatel y4,00 0 psi . Th e pressur e a t th e sid e o f th e bow l betwee n the tw o widel y space d fastener s wa s approximatel y80 0 ps i o r less . Th e averag e forc e fo r th e interfac e wa s 267 0 Ibf . Assembl yusing 4. 5 inch-pound s o f fastene r torqu e als o reveale d a non uniformclampin g forc e o n th e gaske t betwee n the throttl e bod yan d th e bowl . Th e pressur e betwee n th e two closel y space d fastener s wa s approximatel y9 8 Ibf . Th e pressur e a t th e sid e o f th e bow l betwee n th e tw o wid e space d screw s wa s approximatel y7 0 Ib f o r less . Th e averag e forc e fo r interfac e wa s 23 5 Ibf .

Pag t e s f 1 4

# 9. 0 Precisio n Airmotiv e MA-3SP AThrottl e Body-to-Bow l Ta b Loc k Washe r Testin g Th e Precisio n Airmotiv e MA-3SP Acarbureto r utilize s deformabl e tab loc k washer s o n th e four throttl e body-to-bow l fastener s i n an attemp t t o secur e th e fastener s i n place . Th e deformabl e tab loc k washer s wer e the resul t o f a desig n chang e fro

m th e origina l safet ywire d throttl e body-to-bow l fastene r design . Test s wer e performe d o n an MA-3SPAcarbureto r using ne w ta b loc k washers . Th e Precisio n Airmotiv e MA-3SP Amanua l require s tha t th e fou r throttl e body-to-bow l fastener s b e tightene d t o 3 5 t o 4 5 inch-pound s followe d b yth e bendin g o f a t leas t two o f th e fou r loc k tab s towar d the hea d o f eac h fastener . Th e Precisio n Airmotiv e instruction s don' t war n o f insufficien t bending o f th e tab s t o maintai n contac t wit h the fastene r head . Testin g reveale d tha t approximatel y4 5 pound s forc e wa s require d t o bend a ta b t o th e head o f a fastener , a s show n i n Enclosur e 18A . Afte r bending , the tab wa s observe d t o spring bac k 0.01 0 inch , a s show n i n Enclosur e 18B . I f th e ta b loc k washer s ar e ben t s o tha t a clearanc e o f 0.01 5 inche s exist s betwee n th e ta b an d th e corner s o f th e fastene r head , th e fastene r ca n rotat e freel ywithi n th e ta b loc k washer , thu s defeating th e ta b loc k feature . I f th e clamp-u

p betwee n th e throttl e bod yan d bow l i s insufficien t t o preven t rotatio n o f the throttl e body-to-bow l fasteners , th e fastener s ca n bac k ou t o f th e bowl . A s a resul t o f th e shap e o f th e carbureto r throttl e bod ycasting , the fastener s an

d loc k washer s ar e fre e t o rotat e unti l the loc k washe r leg s contac t th e throttl e bod ycasting i n a tightenin g o r loosening direction . Counterclockwis e rotatio n o f th e fastene r an

d loc k washe r t o th e throttl e bod ycasting limit s result s i n a loos e fastene r condition . 10. 0 Precisio n Airmotiv e MA-3SP AThrottl e Bod yFastene r Hol e Markin g Evaluatio n Ane w Precisio n Airmotiv e MA-3SP Acarbureto r wa s obtaine d an d examine d fo r th e conditio n o f th e throttl e bod yfastene r hol e surfaces . Examinatio n o f th e surface s reveale d sharp mark s wit h rotationa l smearing fro minstallatio n o f th e fasteners , a s show n i n Enclosure s 19 Aan d 19B . Th e presenc e o f th e fastene r contac t mark s i n th e throttl e bod yo f a ne w MA-3SPA carbureto r i s th e resul t o f misalignmen t o f th e hole s i n the carbureto r bow l wit h respec t t o the throttl e body . Th e _-_j—-— — 

## H

# thread s o f th e fastener s ca n contac t an d cu t th e throttl e bod yhol e durin g th e assembl yprocess . Th e resul t i s a dra g o n th e fastener s durin g installatio n whic h result s i n a n inadequat e clampin g forc e applie d t o th e throttl e body-to bow l joint . Numerou s use d MA-3SP Acarburetor s wer e obtaine d fro mth e fiel d fo r examinatio n o f th e throttl e bod yfastene r holes . Th e throttl e bod yfastene r hol e surface s exhibite d mark s simila r t o thos e observe d i n th e ne w MA-3SP Acarburetor . 11. 0 Precisio n Airmotiv e MA-3SP AThrottl e Bod yFastene r Hol e

Impac t Testin g A n impac t tes t wa s performe d i n whic h a mas s o f 5. 8 pound s wa s droppe d a distanc e o f 2 1 inche s ont o a throttl e body-to bow l fastene r whic h resulte d i n impac t mark s o n th e finishe d throttl e bod yfastene r hol e surface . Th e dro p tes t fixtur e i s show n i n Enclosur e 20 Aan d th e resultin g mark s o n th e throttl e bod yfastene r hol e ar e show n i n Enclosur e 20B . Examinatio n o f th e impact-induce d mark s reveale d brinne l typ e feature s wit h n o horizonta l o r vertica l smearin g o r polishing . Th e resultin g mark s woul d correspon d t o fastene r mark s cause d b yaircraf t groun d impact . Th e mark s wer e significantl ydifferen t fro mth e mark s observe d i n th e fastene r hole s fo r th e subjec t MA-3SP Acarbureto r fro mth e acciden t aircraft . 12. 0 Precisio n Airmotiv e MA-3SP AThrottl e Bod yFastene r Hol e

Shake r Testin g Alaborator yvibratio n tes t wa s performe d o n a Precisio n Airmotiv e MA-3SP Acarbureto r t o evaluat e th e characteristic s o f fastene r threa d mark s lef t o n a throttl e bod yfastene r hol e surfac e cause d b ya loos e bow l condition . Th e vibratio n tes t fixtur e i s show n i n Enclosur e 21 Aan d th e resultin g mark s o n th e throttl e bod yfastene r hol e surfac e show n i n Enclosur e 21B . Th e resultin g mark s cause d b yth e loos e bow l conditio n exhibite d surfac e polishin g an d axia l mark s cause d b yaxia l motio n o f th e fastene r wit h respec t t o th e throttl e bod yhol e surface . Th e mark s ar e simila r t o thos e observe d o n th e subjec t MA-3SP Acarbureto r throttl e bod yfastene r holes .

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# 13. 0 Precisio n Airmotiv e MA-4SP ACarbureto r Needl e Valve/Floa t Stickin g Effect s Fiel d test s wer e performe d o n a Precisio n Airmotiv e MA-4SP A Carbureto r mounte d t o a Lycomin g O-320-E2 D engin e i n whic h th e floa t wa s prohibite d fromrisin g wit h th e fue l leve l i n th e bowl , a s show

n i n Enclosur e 22 . Th e resul t o f restrictio n o f th e needl e valv e movemen t wa s overflo w o f unmetere d fue l int o th e throa t o f th e carburetor . Simila r test s wer e performe d o n a MA-3SP Acarbureto r i n th e laboratory . Th e test s demonstrate d tha t restrictio n o f th e movemen t o f th e MA-3SE>Acarbureto r floa t prevente d th e floa t fro m trackin g wit h th e fue l leve l t o shu t of f th e fue l flow a t th e needl e valve . Th e restrictio n o f th e needl e valv e movemen t resulte d i n a n overflo w o f th e carbureto r bow l an d entryo f unmetere d fue l int o th e throa t o f th e carburetor , a s show n i n Enclosur e 23 . 14. 0 Discussio n

Th e Precisio n Airmotiv e MA-3SP Acarbureto r ha s a potentia l failur e mod e whereb yth e restrictio n o f floa t movemen t result s from

a numbe r o f material s issue s withi n th e carburetor , includin g floa t sinkin g du e t o fue l entr yint o th e floa t resultin g fromcrackin g o r failur e t o properl ysea l th e float , floa t dra g o n th e sid e o f th e carbureto r bow l du e t o wea r o f th e floa t hing e and/o r hing e pin , needl e valv e stickin g withi n th e sea t du e t o debri s generatio n cause d b y needl e valv e flaking , needl e valv e sticking withi n th e sea t du e t o debri s generatio n cause d b yneedl e valv e sea t wear , an d needl e valv e stickin g du e t o wea r an d groovin g o f th e needl e valv e seat . Restrictio n o f th e motio n o f th e floa t an d inabilit yo f th e floa t t o trac k th e fue l leve l i n th e bow l result s i n th e inabilit yo f th e needl e valv e t o properl y seat , fue l rising i n th e carbureto r bow l an d unmetere d fue l entryint o th e throa t o f th e carburetor . Th e lac k o f a fue l bow l overflo w failur e counter-measur e i n th e even t tha t th e needl e valv e i s n o longe r fre e t o regulat e fue l flow int o th e bow l result s i n unmetere d fue l entryint o th e throa t o f th e carbureto r an d th e engine .

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# 15. 0 Conclusion s Th e followin g conclusion s hav e bee n reache d t o dat e base d o n revie w o f cas e documents , literatur e research , laborator y examinatio n an d analysis , an d testin g o f exempla r components . 1 . Th e Precisio n Airmotiv e MA-3SP Acarbureto r utilize d i n th e Teledyn e Continenta l O-200- Aengin e an d th e Precisio n Airmotiv e MA-4SP Acarbureto r utilize d i n th e Lycomin g O-320-E2 D engin e bot h exhibi t simila r operationa l vibration s tha t ar e significan t i n magnitud e throug h th e operationa l RP M rang e fo r th e engines . Basis : Fiel d Testin g 2 . Th e Precisio n Airmotiv e MA-3SP Acarbureto r use s floa t ris e an d fal l wit h fue l leve l t o regulat e fue l flo w b y th e needl e valve . Th e forc e actin g t o clos e th e needl e valv e b yfloa t buoyanc yi s 0.9 1 ounce s a t a needl e valv e openin g o f 0.02 6 inches . Basis : Laborator yTestin g 3 . Th e Precisio n Airmotiv e MA-3SP Acarbureto r retracto r cli p forc e actin g t o retrac t th e needl e fro mth e sea t b y th e weigh t o f th e float s i s 2. 5 ounces . Basis : Laborator yTestin g 4 . Th e Precisio n Airmotiv e MA-3SP Aaircraf t carbureto r i s derive d fro ma Marvel-Scheble r tracto r carbureto r whic h utilize d a stainles s stee l needl e valv e i n a bras s seat . Basis : Laborator yAnalysi s an d Revie w o f Technica l

Dat a 5 . Th e origina l Marvel-Scheble r MA-3SP Aaircraf t carburetor s desig n utilize d hollo w bras s float s an d a bras s floa t plat e whic h contacte d a stainles s stee l needl e valv e i n a bras s seat . Basis : Laborator yAnalysi s 6 . Th e Precisio n Airmotiv e MA-3SP Aaircraf t carbureto r float s hav e undergon e numerou s materia l change s du e t o malfunctio n o f th e fue l meterin g syste man d floa t interactio n wit h th e needl e valve . Pag a1 0 o C 1 4